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Chemistry: Characteristics of Matter

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1. chem_matter_tickall _2  Which of the following are the main constituent of sand (tick all that apply

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2. chem_matter_1  Tick all the characteristics of metals

 

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Chemistry: Matter and Separation MCQ_1

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1. chmatsep_13 What are the two classes of elements

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2. chmatsep_41 which of the following is not correct about diffusion

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3. chmatsep_2 what is the solvent in brass

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4. chmatsep_40 Which of the following is not correct about osmosis

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5. chmatsep_23 The two classes of compounds are

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6. chmatsep_9 Chemistry is defined as

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7. chmatsep_29 which of the following is not correct about difference between mixture and compound

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8. chmatsep_24 The states in which matter can exist include the following except

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9. chmatsep_3 what is the solute in steel

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10. chmatsep_31 What is a saturated solution

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11. chmatsep_49 which of the following takes up the shape of the container in which it is placed

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12. chmatsep_39 The dispersion of solid in liquid where the solid is more dominant than the solvent is called

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13. chmatsep_1 what is the solute in tincture of iodine

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14. chmatsep_32 what I saturated solution of common salt is

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15. chmatsep_11 a substance which cannot be broken down into a simpler substance by any chemical method is

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16. chmatsep_4 A reaction in which a substance undergoes temporary change is

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17. chmatsep_7 Everything in the universe is made up of

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18. chmatsep_35 The scattering of light by the colloids in a colloidal solution is called

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19. chmatsep_33 A solution in which small quantity of solute dissolves in large quantity of solvent is

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20. chmatsep_21 The most abundant element on the surface of the earth and in the earth crust are

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21. chmatsep_42 Which of the following is not true about water

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22. chmatsep_36 the dispersion of liquid or solid in gas is called

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23. chmatsep_12 What is the smallest unit of an element

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24. chmatsep_50 When a liquid turns to gas at temperature lower than its boiling point it is called

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25. chmatsep_16 which of the following is not a property of metals

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26. chmatsep_15 which of the following is not a property of metals

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27. chmatsep_8 Anything that has space mass and occupies space is

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28. chmatsep_26 one of the most abundand substances on the surface of the earth

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29. chmatsep_6 which of the following is not a property of non-metals

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30. chmatsep_27 which of the following is not correct about mixtures

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31. chmatsep_48 Which of the following is not correct about gas

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32. chmatsep_28 which of the following is not correct about a compound

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33. chmatsep_30 Which of the following is not correct about solution

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34. chmatsep_34 A solution in which large quantity of solute dissolves in small quantity of solvent is

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35. chmatsep_10 Any form of matter which contains a single substances is

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36. chmatsep_45 which of the following is not an example of organic solvent

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37. chmatsep_20 which of the following is a metalloid

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38. chmatsep_5 A reaction in which a substance undergoes permanent change is

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39. chmatsep_38 the dispersion of liquid or solid in another liquid is called

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40. chmatsep_18 which of the following is not a property of non-metals

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41. chmatsep_44 which of the following is not an example of organic solvent

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42. chmatsep_14 A substance formed when two or more elements combine in a fixed proportion in a chemical reaction

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43. chmatsep_22 the elements that make up sand are

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44. chmatsep_25 one of the most abundand substances on the surface of the earth

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45. chmatsep_19 A substance that has some properties of metals and non-metal

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46. chmatsep_47 which of the following is not correct about liquid

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47. chmatsep_46 Which of the following is not correct about solid

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48. chmatsep_17 which of the following is not a property of metals

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49. chmatsep_37 which of the following is not a type of colloidal solution

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50. chmatsep_43 The process by which the solid particles in a suspension settle to the bottom by gravity is called

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Chemistry: Matter and Separation MCQ_paper 2

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1. matsep81-Which of the following is not correct about an ion

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2. matsep54-Which of the following is not a property used in separating constituents of a mixxture

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3. matsep94-The droplets of water observed around a bottle of milk taken out of the refrigerator are due to?

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4. matsep75-Which of the following is used to separate a mixture of ethanola dn water

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5. matsep71-which of the following is not a separation method

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6. matsep83-which of the following is a chemical change

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7. matsep74-which of the following is used to separate a mixture of kerosene and water

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8. matsep69-which of the following separation methods is not based on particle size

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9. matsep100-By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and?

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10. matsep56-which of the following is a method of seperating liquid from liquid

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11. matsep61-which of the following method is not used for separating a solid from another solid

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12. matsep93-Which of the following is an example of a mixture

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13. matsep68-Which of the following separation method is not based on particle size

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14. matsep72-Which of the following is used for separating two immiscible liquids

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15. matsep64-The process by which two or more solids are recovered from the same solvent based on different solubility of the solutes is called

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16. matsep59-which of the following method is used for separating a solid from a solid

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17. matsep86-A substances that contains two or more substances that are chemically combined is

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18. matsep63-The process of recovering a solid from a liquid solvent, without evaporating the solvent completely

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19. matsep91-A mixture of sugar and sulfur can be separated by?

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20. matsep52-The state of disorder in which the particles of the matter begin to move rapidly when the temperature increases is called

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21. matsep78-Which of the following is not a constituent of matter

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22. matsep77-Which of the following method of separation is based on adsorption or adsorbtive properties of constituents

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23. matsep98-A sample of any of the following substances that disappears when exposed to air, like camphor or dry ice, is undergoing?

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24. matsep96-Which of the following is not a mixture

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25. matsep51-The process by which liquid turns to gas at its boiling point is called

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26. matsep79-Which of the following is not correct about physical and chemical changes

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27. matsep58-which of the following method is used for separating a soluble solid from a solution

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28. matsep92-which of the following is a physical change

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29. matsep90-The property used in the industrial preparation of nitrogen and oxygen from air is?

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30. matsep55-which of the following is not a property used in separating the constituents of a mixture

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31. matsep88-A small quantity of solid ammonium chloride (NH₄Cl) was heated gently in a test tube. The solid gradually disappears to produce two gases, and a white cloudy deposit is observed on the cooler part of the test tube. What has occurred?

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32. matsep62-which of the following method is not used to recover a solid from liquid

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33. matsep85-Which of the following is a physical reaction

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34. matsep73-which of the following is used to separate petroleum or crude oil product

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35. matsep95-Which of the following substances is a mixture?

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36. matsep60-which of the following method is not used for separating a solid from another solid

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37. matsep67-which of the following is used to separate blood cells from the plasma of human being

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38. matsep80-The smallest particle of a compound or an element which is capable of independent existence is

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39. matsep57-which of the following is a method of seperating liquid from liquid

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40. matsep89-By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and which substance?

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41. matsep70-Which of the following separation techniques is not based on color or mass

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42. matsep76-which of the following is used to separate a mixture of colored substances

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43. matsep97-Oxygen is absent in?

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44. matsep99-Crude petroleum is converted to useful products by the process of?

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45. matsep66-The process of separating solids from a colloid

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46. matsep65-The process by which 2 or more liquids are separated from a solution based on different boiling points and density is called

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47. matsep82-Which of the following is an example of a chemical change

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48. matsep84-When zinc oxide is heated it turns from white to yellow , then upon cooling , it turns to white. This is an example of

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49. matsep53-when a compound combines chemically with oxygen and air to produce a new substance is called

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50. matsep87-What is the best way to obtain water from a acqueous solution of water and sugar

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Chemistry: Structure of Atoms Vol 1

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1. atm26-Find the relative atomic mass of the element with isotopes X-10, and X-11, with relative abundance of 70% and 30% respectively.

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2. atm28-Which of the following is not correct

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3. atm17-Which of the following is used to measure the atomic mass unit of an atom

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4. atm24-Find the relative atomic mass of the element with isotopes X-16, X-17, and X-18 existing in a ratio of 3:1:1

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5. atm9-The mass number (A) is

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6. atm47-A atom in which the valence shell is completely filled with electron is called

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7. atm19-An atom has a mass number of 40 and atomic number of 21. what is the number of neutrons

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8. atm46-Which of the following has the largest number of electrons in the outermost shell

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9. atm30-The regions of the sub-shell of an atom where an electron is likely to be found is the

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10. atm18-Which of the following is not correct

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11. atm43-The valence electron of an atom are the electrons in

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12. atm16-Which of the following relative atomic mas units is not correct

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13. atm42-when filling the electronic configuration of an atom according to energy level, which of the following is not correct

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14. atm1-Which of the following is not correct about dalton’s atomic theory

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15. atm27-When the vapor of a naturally occuring element was passed into a mass spectrometer. The spectrometer showed two peaks. Which of the following is correct

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16. atm33-the d subshell of an atom has how many orbitals

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17. atm10-Which of the following is not correct about hydrogen

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18. atm15-Which of the following is not correct regarding the process of estimating the mass of an atom

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19. atm39-if an atom has 12 electrons the last electron will be located in which shell

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20. atm13-the current standard for estimating the mass of an atom is relative to the mass of

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21. atm23-An element has two isotopes X-20 and X-22 . The isotopes exist in ratio 3:1. what is the relative atomic number of the element

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22. atm12-Which of the following is not correct

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23. atm50-An atom is electrically neutral because

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24. atm21-An atom as atomic number of 8 and 7 neutrons. What is the mass number

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25. atm7-Which of the following is not correct

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26. atm38-If an atom has 3 electrons the first electron will be located in which shell

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27. atm48-The number of atoms in one molecule of an element is the

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28. atm8-Which of the following is not correct

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29. atm49-Which of the following is not true about the atomic theory ( Dalton’s atomic theory)

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30. atm44-how many electrons can the f subshell hold

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31. atm2-Which of the following are the components of an atom

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32. atm41-Which of the following is not correct about how to write the electronic configuration of an atom

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33. atm22-An atom as atomic number of 8 and 7 neutrons. What is the number of electrons

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34. atm40-If an atom has 16 protons, the last electron will be located in which shell

35 / 50

35. atm36-What is the maximum number of electrons that the 4th shell of an atom can hold

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36. atm20-An atom has a mass number of 40 and atomic number of 21. what is the number of electrons

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37. atm5-Which of the following are the three subatomic particles of an atom

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38. atm31-The s-subshell has how many orbitals

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39. atm6-Which of the following is not correct.

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40. atm11-An atom has a mass number of 27 and and atomic number of 17. which of the following is not correct

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41. atm45-how many electrons can the d subshell hold

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42. atm35-What is the maximum number of electrons each orbital of an atom can hold

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43. atm3-Which of the following form the shell of atoms

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44. atm4-Which of the following form the nucleus of an atom

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45. atm29-Which of the following is not correct

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46. atm14-the current standard for estimating the mass of an atom is relative to the mass of

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47. atm25-An element has two isotopes X-23 and X-24 . The isotopes exist in ratio 3:1. what is the relative atomic number of the element

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48. atm37-The order in which the electrons enter the orbital in the various energy sublevel of an atom is described by

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49. atm32-The p subshell of an atom has how many orbitals

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50. atm34-the f subshell of an atom has how many orbitals

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Chemistry: Structure of Atoms Vol 2

1 / 50

1. atm92_The formula which represents the simplest ratio in which opposite ions of elements can combine is called the

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2. atm82_Which of the following is not correct about the changes that occur in a chemical combination between atoms

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3. atm59_who discovered the neutron

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4. atm88_The atom and ion of sodium have

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5. atm53_Which of the following is not correct about cathode rays

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6. atm60_Which of the following is not correct

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7. atm77_The mean atomic mass of chlorine is 35.5. Chlorine has two isotopes of mass 35 and 37. What is the percentage composition of the isotope of mass number 35?

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8. atm85_An atom has the following electronic shell configuration (2,8,1). Which of the following is not correct

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9. atm54_Which of the following does not occur when an atom receives an electron

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10. atm55_The particle generated in the cathode ray experiement is

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11. atm95_Which of the following is not correct about calcium atom with atomic number of 20

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12. atm87_If the mass number of X is 24 and X2+ contains 10 electrons. The nucleus of X will contain

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13. atm58_Who discovered the proton

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14. atm74_Which of the following is not correct about the 3d-orbitals

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15. atm69_Which of the following inot correct about the principal quantum number of an atom

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16. atm73_Orbitals that are in the same energy level and have the same energy are referred to as

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17. atm99_An atom has atomic number of 10. In the electronic configuration the last electron will have

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18. atm83_Which of the following is not correct about the changes that occur in a chemical combination between atoms

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19. atm62_The theory or idea that the electron circle the nucleus of an atom like the planetary arrangement was proposed by

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20. atm71_which of the following is not correct about the principal quantum number and the shells of an atom

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21. atm81_During a chemical reaction the atom that transfers the valence electron is usually the

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22. atm78_An atom of an element has mass number Y and atomic numberZ. Which of the following detemines the chemical properties of the atom/element

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23. atm68_The energy level in an atom a denoted by the principal quantum number

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24. atm94_In the reaction between sodium ion (Na+) and Chlorine ion (Cl-). Which of the following is not correct

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25. atm70_Which of the following is not correct about the principal quantum number of an atom

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26. atm75_The number of protons and neutrons in a atom is called the

27 / 50

27. atm84_During a chemical reaction an atom (N) with atomic number of 11 and mass number of 23 lost an electron. Which of the following is not correct about the new state of the atom

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28. atm93_the following reaction Ca -2e=Ca2+ is

29 / 50

29. atm96_Which of the following is not a rule or principle governing the order in which electrons fill the orbitals

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30. atm79_which of the following is not a type of chemical combination between atoms

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31. atm86_Which of the following is not correct

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32. atm51_During which experiment was the atom discovered

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33. atm100_An atom has atomic number of 12. In the electronic configuration, the final electron will have

34 / 50

34. atm72_The quantum number that describes the orbitals in each of the s, p,d and f sub-shells is called

35 / 50

35. atm90_Which of the following is not correct about the formation of ionic or electrovalent bond between two atoms

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36. atm52_Who discovered the electrons

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37. atm65_the observation that cathode rays can cause small wheels placed in their path to rotate shows that the cathode rays

38 / 50

38. atm89_A binary compound has how many elements

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39. atm67_The observation that cathode rays heat up metal foils placed in their path show that

40 / 50

40. atm76_Which of the following is not true about the valency of an element

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41. atm56_Cathode rays cause and object placed behind a perforated anode to cast shadow on the screen. This observation shows that the rays

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42. atm57_Which of the following does not occur when an electron is removed from an atom

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43. atm64_The observation that cathode rays are deflected to the positive plate of an electric field show that

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44. atm91_During a chemical combination reaction, the electronic configuration of an element changes from an initial state with electronic configuration 1s2-2s2-2p6-3s1(2,8,1) to a new state with electronic configuration of 1s2-2s2-2p6(2,8). Which of the following is not correct

45 / 50

45. atm63_Which of the following is not correct

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46. atm98_During the filling of an orbital with electron. The first electron had an upward spin, the second electron will have

47 / 50

47. atm97_Which of the following is not correct

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48. atm66_the observation that cathode rays are deflected by an electric or magnetic field show that

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49. atm61_which of the following is not correct

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50. atm80_The type of chemical combination where one atom completely transfers its valence electrons to another atom such that the two atom assume stable noble gas structure is called

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Chemistry: Periodic Table Vol 1

1 / 50

1. period_38_Which of the following is not correct about the elements in group two of the periodic table

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2. period_2_Which of the following is not correct about the periodic table

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3. period_27_An element which as atomic number of 11 is likely to have similar chemical properities with another element having atomic number

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4. period_30_Elements which loose electron to convert to ions are

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5. period_3_which of the following is not correct about the elements in group 8 of periodic table

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6. period_19_Group VII elements in their combined states are called:

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7. period_43_which of the following is not correct about the trasnsition elements

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8. period_42_Which of the following is not correct about the elements in group Zero of the periodic table

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9. period_40_Which of the following is not correct about the elements in group three of the periodic table

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10. period_10_Elements in the same period of the periodic table have the same:

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11. period_5_Which of the following is not correct about the periodic table

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12. period_35_which of the following isnot correct about the period or horizontal row of the periodic table

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13. period_36_Which of the following is not correct about the group oen elements in the periodic table

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14. period_46_The number of electrons in each shell (n) of an atom is give by the formula

15 / 50

15. period_22_Electrons enter into orbitals in order of increasing energy as exemplified by:

16 / 50

16. period_39_Which of the following is the most commonly encountered element of the group three of the periodic table

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17. period_32_A new element “KR” was just discovered in Nigeria. The element has the following properites. It melts at 35oC, it does not conduct electricity , and the chemical reaction was as shown below. Kr + e = Kr-. Which of the following is not correct about the substance

18 / 50

18. period_28_Which of the following describes the diagonal relationships in the periodic table

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19. period_26_which of the following is not correct about the periods or horizontal rows in the periodic table

20 / 50

20. period_18_Which of the following elements has the highest ionization energy?

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21. period_50_The electron configuration of an atom with atomic number of seven is

22 / 50

22. period_16_Which transition metal is not attracted to an external magnetic field?

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23. period_9_The stability of noble gases is due to:

24 / 50

24. period_31_Elements which gain electrons to convert to ions are

25 / 50

25. period_7_Which elements belong to the third period of the periodic table?

26 / 50

26. period_41_Which of the followinig is not true about the elements in group seven of the periodic table

27 / 50

27. period_48_Which of the following is not correct about elements in the periodic table

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28. period_4_Which of the following is not correct about the periodic table

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29. period_21_An element with atomic number 17 resembles which of the following elements?

30 / 50

30. period_44_which of the following is the configuration system for numbering the shells of an atom from the inner to the outer shell

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31. period_17_An atom of element X has the electronic configuration of 1s² 2s² 2p⁶ 3s² 3p³. In which group of the periodic table is element X found?

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32. period_12_What is the correct order of decreasing activity among the metals Fe, Ca, Al, and Na?

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33. period_13_If an element X has 127 neutrons and 82 electrons, what is its atomic number?

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34. period_23_Which of the following is not correct about the relationships of elements in the same group of the periodic table

35 / 50

35. period_37_Which of the following is not correct about the group one elements of the periodic table.

36 / 50

36. period_29_Which of the following is correct about elements in diagonal relationship of the periodic table

37 / 50

37. period_47_Which of the following is not correct about the maximun number of electrons each subshell of an orbit can accommodate?

38 / 50

38. period_8_The general rise in the first ionization energy as you move from left to right across a period can be attributed to:

39 / 50

39. period_45_Each orbital shell around the nucleus of an atom has sub-shells that are number as

40 / 50

40. period_11_Which noble gas is known for its high power of fog penetration, used in aerodrome beacons?

41 / 50

41. period_33_What is the difference between chemical properties of metals and nonmetals

42 / 50

42. period_34_Which of the following is not correct about the periodic table

43 / 50

43. period_24_Which of the following is not correct about the relationships of elements in the same group of the periodic table

44 / 50

44. period_25_Which of the following is not correct about halogens

45 / 50

45. period_20_What is the most abundant rare gas in the atmosphere?

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46. period_1_Which of the following is not correct about the periodic table

47 / 50

47. period_6_Chlorine, bromine, and iodine resemble one another in that they:

48 / 50

48. period_15_Beryllium and aluminum exhibit similar properties because they:

49 / 50

49. period_14_To correct the electrochemical series of K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au, which elements should be interchanged?

50 / 50

50. period_49_Which of the following is not correct about the electron configuration

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Chemistry: Chemical Formula 1

1 / 50

1. chem_formula11_which of the following is not correct about electrovalent or ionic bond

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2. chem_formula15_Which of the following is not a force of attraction between molecules in covalent bond

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3. chem_formula13_Which of the following is not correct about dative or coordinate covalent bond

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4. chem_formula20_The following elements are diatomic except

5 / 50

5. chem_formula35_Calculate the molecular mass of Mg(NO3)2 [ Mg=24, N=14, O=16)

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6. chem_formula17_IF a molecule of an element is formed by two atoms. Then the atomicity of 3 molecules of the element will be

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7. chem_formula43_A hydrated salt of formula MSO4.xH2O CONTAINS 45.3% by mass of water of crystalisation. Calculate the value of x [M = 56, S = 32, O = 16, H = 1 ]

8 / 50

8. chem_formula7_An element A with electronic configuration 1s2-2s2-2p6-3s2 combines with another elememt B with electronic configuration 1s2-2s2-2p6-3s2-3p5. What is the compound formed

9 / 50

9. chem_formula27_which of the following is a radical

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10. chem_formula23_Which of the following is not correct about how to write chemical formula

11 / 50

11. chem_formula14_Which of the following is not correct about metallic bond

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12. chem_formula50_What is the empirical formula of an organic compound, which contains 80% Carbon and 20% hydrogen [C=12, H=1]

13 / 50

13. chem_formula2_An element R with atomic number 3 and another element Q with atomic number 8 undergo a chemical reaction. Which of the following is correct chemical formula of the compound formed

14 / 50

14. chem_formula47_Which of the following is the appropriate chemical formula for calcium hydroxide

15 / 50

15. chem_formula30_how many hydrogen atoms are present in (NH4)2C2O2

16 / 50

16. chem_formula38_The emperical formula of a compound is calculated from

17 / 50

17. chem_formula21_A molecule composed of 3 atoms is

18 / 50

18. chem_formula40_If atom has electronic configuration of 1s2-2s2-2p3, what is the valency

19 / 50

19. chem_formula26_A group of atoms of two or more elements having a negative or positive charge is a

20 / 50

20. chem_formula5_An element A with electronic configuration 1s2-2s2-2p6-3s2 combines with another elememt B with electronic configuration 1s2-2s2-2p6-3s2-3p5. Which of the following is correct regarding the electronic configuration in the principal KLM shells

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21. chem_formula39_If atom has electronic configuration of 1s2-2s2-2p3, what is the valence electron

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22. chem_formula4_An element R with atomic number 3 and another element Q with atomic number 8 undergo a chemical reaction. Which of the following is not correct

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23. chem_formula16_The number of atoms in one molecule of an element is called

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24. chem_formula42_if the atom of a newly found element has 64 electrons , what will be the atomic number of the atom

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25. chem_formula49_The mass of a matter tha has one-twelfth the mass of carbon-12 is

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26. chem_formula22_a molecule composed of more than 3 atoms is

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27. chem_formula25_Which of the following is not correct about the following molecular formula 2Al2O3 (where the 2 after the Al is subscript and the 3 after the O is also subscript)

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28. chem_formula44_A hydrated salt of formula MSO4.xH2 O CONTAINS 37% by mass of water of crystalisation. Calculate the value of x [M = 56, S = 32, O = 16, H = 1 ]

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29. chem_formula37_What is the percentage composition by mass of Ca in CaO [Ca=40, O=16]

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30. chem_formula31_what is the atomicty of (NH4)2C2O2

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31. chem_formula1_An element R with atomic number 3 and another element Q with atomic number 8 undergo a chemical reaction. Which of the following is correct

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32. chem_formula28_which of the following will be produced from the combination of Ca2+ and OH-

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33. chem_formula29_which of the following chemical formula is not correctly written

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34. chem_formula8_Which of the following is not correct about covalent bond

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35. chem_formula46_Two elements Z and X combine forming a compound. If Z is a non-metal with valency of 3 and X is a metal with valency of 2 what is the chemical formula of the compound formed

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36. chem_formula32_which of the following is correct about atomic mass of an atom X

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37. chem_formula10_Which of the following is not correct about ionic or electrovalent bond

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38. chem_formula9_Which of the following is not correct about covalent bond

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39. chem_formula34_Calculate the molecular mass of CaCO3 [ Ca=40, C=12, O=16)

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40. chem_formula41_If atom has electronic configuration of 1s2-2s2-2p3, what is the number of bonds it can form

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41. chem_formula48_Which of the following is correct about the Relative atomic mass of atoms

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42. chem_formula3_Which of the following is not correct about the atomic number and electronic configuration regarding chemical combinations

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43. chem_formula45_Two elements Z and X combine forming a compound. If Z is a non-metal with valency of 2 and X is a metal with valency of 1 what is the chemical formula of the compound formed

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44. chem_formula36_What is the relative atomic mass of M in M2O3 if the relative molecular formula is 160 [O=16]

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45. chem_formula24_Which of the following is not correct about one molecule of water(H2O)

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46. chem_formula19_if two atoms of B combine with one atom of A to form one molecule ( AB2), what is the atomicity of 4AB2

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47. chem_formula18_if two atoms of B combine with one atom of A to form one molecule (AB2), what is the atomicity of AB2

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48. chem_formula33_the relative molecular mass of an atom, element or molecule is written in

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49. chem_formula12_which of the following is not correct about covalent

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50. chem_formula6_An element A with electronic configuration 1s2-2s2-2p6-3s2 combines with another elememt B with electronic configuration 1s2-2s2-2p6-3s2-3p5. Which of the following is not correct

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Chemistry: Chemical Formula 2

1 / 50

1. chem_formula53_The emperical formula for Glucose (C6H12O6) is

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2. chem_formula77_How many atoms of Fe are present in 1 mole [molar mass of Fe is 65g]

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3. chem_formula60_A hydrocarbon contains 80% carbon by mass. If the relative moleclar mass of the hydrocarbon is 30, what is the molecular mass of the hydrocarbon [C=12, H=1]

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4. chem_formula85_A reaction in which two compounds react to produce two different compounds is

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5. chem_formula57_A compound contains 37.% of cu and 41.7% of Cl and the rest is water of crystallization. What is the emperical formula ?[Cu=63.5, Cl=35.5 and H2O=18]

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6. chem_formula78_how many atoms are present in 130g of Fe [ molar mass of Fe=65g]

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7. chem_formula79_what is the molar mass of a substance in mol/g if 0.4mol is 25g

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8. chem_formula81_Calculate the number of silver atoms in pure silver bracelet tha has a mass of 35g [ag=108, Avogadro constant 6.02 x1023 ]

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9. chem_formula84_what type of reaction is this Zn(s) + CuSO4(aq) = ZnSO4(aq) + Cu(s)

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10. chem_formula92_What is the amount of sulphur(IV) oxide required to deposit 12g of of sulphur on reacting with excess hydrogen sulphide

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11. chem_formula74_Which of the following has the largest mass of the same substance

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12. chem_formula51_The emperical formula for ethane (C2H6) is

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13. chem_formula96_What is the amount of sulphur(IV) oxide required to deposit 12g of of sulphur on reacting with excess hydrogen sulphide

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14. chem_formula64_which of the following is not correct about oxidation number

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15. chem_formula73_What is the correct IUPAC name for NO2-

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16. chem_formula82_what type of reaction is this H2(g) + Cl2(g) = 2HCl(g)

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17. chem_formula93_what is the chemical formula for iron(II) sulphide

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18. chem_formula94_What is the formula for sulphur(IV)oxide

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19. chem_formula87_A substance which changes the rate of a chemical reaction without being used up in the reaction is

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20. chem_formula54_How many moles of carbon are present in 56g of C particle (C=12)

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21. chem_formula58_Which of the following is correct about the relationship between molecular and emperical formula in solving chemical formula and equation

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22. chem_formula98_Balance the equation: Na+H2O→NaOH+H2. Which of the following is correct?

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23. chem_formula65_Determin the oxidation number of iodine in IO3 –

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24. chem_formula68_What is the oxidation number of boron in Na[B(NO3)4]

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25. chem_formula90_When 21g of iron filing and 15g of powdered sulphur are head, Yg of iron(II) sulphide was obtained . Which reactant is in excess and by how much?

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26. chem_formula66_Which of the following terms indicates the number of bonds that can be formed by an atom

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27. chem_formula72_which of the following is not correct about the naming convention for acids containing oxygen or oxoacids

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28. chem_formula100_What is the correct coefficient for HCl when balancing the equation: Zn+HCl→ZnCl2+H2?

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29. chem_formula67_What is the oxidation number of X in X2O72-

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30. chem_formula86_A reaction which can proceeds forward or backwards under different conditions of temperature and pressure

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31. chem_formula95_write the balanced equation for hydrogen sulphite reacting with sulphur IV oxide to librate Sulphur

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32. chem_formula91_In a reaction between compounds A and B, a new substance C is formed and there is remnant of B. which of the following is correct

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33. chem_formula62_A gaseous metallic chloride MCl consist of 20.22% of M by mass, the molecular formula is [M-27, Cl-35.5]

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34. chem_formula76_The molar mass of carbon is 12g and the molar mass of oxygen is 16g . Which of the following is correct

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35. chem_formula97_Which coefficient correctly balances the following equation? C3H8+O2→CO2+H2O

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36. chem_formula71_Acids that contain oxygen atoms are called

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37. chem_formula55_Calculate the emperical formul of a compound containg 43.4% sodium, 11.3% carbon and 45.3% oxygen. [Na-23, O=16 , c=12]

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38. chem_formula59_Which of the following is correct about the relationship between molecular and emperical formula in solving chemical formula and equation

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39. chem_formula83_what type of reaction is this 2HgO(s) = 2Hg(l) + O2(g)

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40. chem_formula75_Which of the following is correct. If molar mass of element A is 2g and Molar mass of element B is 3g then

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41. chem_formula61_What is the molecular mass of an organic compound with emperical formula of CH2O [C=12, O=16, H=1]

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42. chem_formula52_The emperical formula for benzene (C6H6) is

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43. chem_formula56_Find the emperical formula for an oxide of iron containing 79% iron[F3=66,O=16].

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44. chem_formula70_which of the following is not correct about the naming convention for a binary compount ( a compound containing two elements)

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45. chem_formula69_which of the following is not correct about compounds

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46. chem_formula63_which of the following is not correct about oxidation number

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47. chem_formula99_How many moles of H₂ are needed to completely react with 3 moles of N₂ to form NH₃? N2+H2→NH3

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48. chem_formula88_A reaction in which the rate of forward or backward direction is determined only by temperature is

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49. chem_formula80_what is the mas of 0.105 mol of Na2Co3.10H2O [H=1, C=12,O=16,Na=23]

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50. chem_formula89_Which of the following is not a characteristic of catalysts

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Behavior of Gases

1 / 50

1. gas1_What are the two variables that determine th volume of a fixed mass of gas

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2. gas1_which of the following is not correct about absolute zero temperature point

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3. gas1_A sample of a gas occupies a voluem of 0.6dm3 at temperature of 430K and at atmospheric pressure. What will be the voluem of the gas at 430K and at 507mmhg [atm pressure=760mmhg]

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4. gas1_A gas sample with initial volume of 3.25dm3 is heated and allowed to expand to 9.75dm3 at constant pressure . What is the ratio of the final absolute temperature to the initial absolute temperature

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5. gas1_Which of the following correctly represents the mathematical equation for the general gas equation

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6. gas1_A mass of gas occupies 100cm3 at 1.0x 105Nm-2, what will be the volume of the gass at 0.5x 105Nm-2. If the temperature remains constant

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7. gas1_What is the teperature of a given mass of gas initially at 0 degree celsius and 9 atmosphere, If the pressure reduces to 3 atmosphere at constant volume

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8. gas1_When air is compressed?

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9. gas1_convert temperature of 280K to Celcius

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10. gas1_the value of standard temperature and pressure (S.T.P) are

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11. gas1_273K is equal to

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12. gas1_A mass of gas has Pressure P1 and volume V1 . If the Pressure of the container is increased. Which of the following will occur

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13. gas1_which of the following characteristics determines the direction of diffusion or flow of gases

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14. gas1_A gas exerts pressure on its container because?

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15. gas1_which of the following correctly represents boyle’s law, where K is constant , V is volume and P is pressure

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16. gas1_The molecules of gas have different kinds of motion, which of the following is not one of them

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17. gas1_A gas measures 1dm3 at a temperature of 27 oC and 300mmhg. To what temperature must the gas be heated when the pressure rises to 480mmhg for the volume to remain unchanged

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18. gas1_Which of the following is not correct about the kinetic theory of gases

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19. gas1_Which of the following is not a physical property of gases

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20. gas1_A substance has boiling point of 4 degree celcius. If the room temperature is 25 degree celcius , the substance is likelty to be

21 / 50

21. gas1_which of the following is charles’ law

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22. gas1_The pressure a gas exerts when it is alone in a container is called its

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23. gas1_A certain mass of gas occupies 330cm3 at 27 degree celsius and 9.0x 104 Nm-2. Calculate its volume at S.T.P (Standard pressure= 1.0 x105 Nm-3

24 / 50

24. gas1_Which of the following statements is NOT correct?

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25. gas1_The basic assumption in the kinetic theory of gases that the collisions of the gaseous molecules are perfectly elastic implies that the?

26 / 50

26. gas1_A car tyre was inflated to pressure of P. after driving a long distance on a sunny day ,what will happen to the pressure

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27. gas1_An ideal gas with Pressure P1 and Volume P1 is subjected to pressure P2 at constant temperature. Which of the following is correct about the behavior of the gas

28 / 50

28. gas1_1 atmosphere pressure is equal to

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29. gas1_Zero degree celcius is equal to

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30. gas1_the ability of gases to change to liquid under high pressure and low temperature is

31 / 50

31. gas1_Convert temperature of 27 degree celcius to Kelvin

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32. gas1_Which of the following statements is correct about intermolecular distances and cohesive forces between gas respectively? They are

33 / 50

33. gas1_which of the following is not correct.

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34. gas1_Which of the following is not correct about the kinetic theory of gases

35 / 50

35. gas1_Which of the following is NOT one of the well defined states in which matter occur

36 / 50

36. gas1_The temperature of a gas is 57 degree Celsius at what temperature will its original volume be halved while the pressure is tripled

37 / 50

37. gas1_Which of the following is the boyle’s law

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38. gas1_A gas placed in a container collides with the wall of the container at a frequency ‘F’. If the volume of the container reduces by half and the temperature remains constant. Which of the following will occur

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39. gas1_which of the following is not correct about an air-filled balloon placed in hot water

40 / 50

40. gas1_the mathematical equation for charles’ low is

41 / 50

41. gas1_To what temperature must a gas at 273K be heated in order to double its volume and pressure

42 / 50

42. gas1_Which of the following is correct about an inflated air-filled balloon placed in hot water

43 / 50

43. gas1_The ratio of initial to final pressure of a gas is 1:1.5 calulate the final volume if the initial volume was 300cm3

44 / 50

44. gas1_An oxide XO2 has a vapour density of 32. What is the atomic mass of X

45 / 50

45. gas1_which of the following is not correct

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46. gas1_the value of absolute zero temprature is

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47. gas1_The volume of a fixe mass of gas measured at atmospheric pressure nad 27 degree celsius is 3.0dm3. Calculate the volume at 127 degree celsius

48 / 50

48. gas1_Which of the following is not true about the Kinetic theory of a fixed mass of gas

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49. gas1_Which of the following does not explain why an increase in temperature of a gas of fixed volume results in increase pressure

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50. gas1_A substance that has boiliing point below room temperature is

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