Posted inunclassified Chemistry: Matter and Separation Techniques 1 Posted by By Agodirin September 23, 2024 Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 21 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950 Created by Agodirin Chemistry: Matter and Separation MCQ_1 1 / 50 1. chmatsep_1 what is the solute in tincture of iodine A) iodine B) salt C) water D) alcohol In a tincture of iodine, iodine is the solute that is dissolved in alcohol (the solvent). The tincture is a solution used as an antiseptic 2 / 50 2. chmatsep_42 Which of the following is not true about water A) it is immisceble with oil B) it dissolves organic solutes C) it is polar D) it is a universal solvent Water is indeed immiscible with oil, as oil and water do not mix due to their differing polarities. The other statements about water being a universal solvent, polar, and dissolving organic solutes are true 3 / 50 3. chmatsep_15 which of the following is not a property of metals A) brittle B) conduction C) ductile D) malleable Metals are generally malleable (can be hammered into shape) and ductile (can be drawn into wires). Brittleness is typically a property of non-metals 4 / 50 4. chmatsep_47 which of the following is not correct about liquid A) it has definite volume B) it has no definite shape C) it can be easily compressed D) it is fluid at room temperature Liquids take the shape of their container and have a definite volume. They are fluid at room temperature and are not easily compressed compared to gases 5 / 50 5. chmatsep_49 which of the following takes up the shape of the container in which it is placed A) residue B) liquid C) gas D) solid Liquids take the shape of their container. Solids maintain their shape, while gases expand to fill the entire volume of the container. 6 / 50 6. chmatsep_20 which of the following is a metalloid A) silver B) silicon C) carbon D) gold Silicon is a well-known metalloid, exhibiting properties of both metals and non-metals. Gold, carbon, and silver are not metalloids 7 / 50 7. chmatsep_40 Which of the following is not correct about osmosis A) There is movement of particles across a membrane B) the particle moves from lower to higher concentration C) the particle that moves is the solute D) the particle moves through a semipermeable membrane In osmosis, the solvent (usually water) moves from an area of lower solute concentration to an area of higher solute concentration through a semipermeable membrane. The solute itself does not move in osmosis. 8 / 50 8. chmatsep_43 The process by which the solid particles in a suspension settle to the bottom by gravity is called A) fractionation B) sedimentation C) decantation D) distillation Sedimentation is the process where suspended solid particles settle out of a fluid under the influence of gravity. 9 / 50 9. chmatsep_27 which of the following is not correct about mixtures A) the constituents have been combined in definite fixed proportion B) the combining of the constituent is by mechanical means C) consists of two or more substances D) the constituents can be separated Mixtures do not have fixed proportions; the components can vary in amount 10 / 50 10. chmatsep_29 which of the following is not correct about difference between mixture and compound A) mixtures can be represented in a chemical formula B) the constituent of mixture retain their individual properties C) the constituents of compound lose their individual property D) there is chemical bond between constituents of compounds Compounds can be represented by chemical formulas, while mixtures cannot, as they do not have a consistent composition. 11 / 50 11. chmatsep_33 A solution in which small quantity of solute dissolves in large quantity of solvent is A) saturated B) diluted C) concentrated D) brine A diluted solution contains a small amount of solute compared to solvent. 12 / 50 12. chmatsep_7 Everything in the universe is made up of A) ion B) neutron C) atom D) matter Matter is anything that has mass and occupies space. It is the substance that makes up all physical objects in the universe. 13 / 50 13. chmatsep_21 The most abundant element on the surface of the earth and in the earth crust are A) carbon and water B) sodium and chloride C) hydrogen and sodium D) silicon and oxygen Silicon and oxygen are the most abundant elements in the Earth's crust, primarily found in silicate minerals. 14 / 50 14. chmatsep_12 What is the smallest unit of an element A) delimiter B) ion C) proton D) atom An atom is the smallest unit of an element that retains the chemical properties of that element. Ions are charged particles derived from atoms, and delimiters are not relevant to this context 15 / 50 15. chmatsep_38 the dispersion of liquid or solid in another liquid is called A) emulsion B) solid C) aerosol D) gel An emulsion is a mixture of two immiscible liquids where one is dispersed in the other 16 / 50 16. chmatsep_19 A substance that has some properties of metals and non-metal A) isomer B) clone C) metalloid D) hybrid Metalloids exhibit properties of both metals and non-metals. They can have metallic luster but are brittle and poor conductors compared to metals. 17 / 50 17. chmatsep_9 Chemistry is defined as A) the study of source, characteristics and growth of matter B) The study of composition and characteristics of human beings C) The study of science and compounds of human interaction with matter D) The study of structure, composition and properties of matter Chemistry is the scientific discipline that studies the properties, composition, and changes of matter, including how substances interact and react with each other 18 / 50 18. chmatsep_30 Which of the following is not correct about solution A) the dissolved particle of solid is crystalloid B) the substance in which another substance dissolves is the solvent C) the dissolving particle is the solute D) the the volume of the solute is usually more than the volume of the solvent In a solution, the solvent typically makes up the greater volume compared to the solute 19 / 50 19. chmatsep_48 Which of the following is not correct about gas A) the particles have relatively fixed position B) there is large space between the particles C) it has no definite shape D) it can be compressed Gas particles are in constant motion and have no fixed positions. They occupy all available space in a container, unlike solids and liquids 20 / 50 20. chmatsep_22 the elements that make up sand are A) hydrogen and sodium B) silicon and oxygen C) carbon and water D) sodium and chloride Sand is primarily composed of silicon dioxide (SiOâ‚‚), which consists of silicon and oxygen. 21 / 50 21. chmatsep_36 the dispersion of liquid or solid in gas is called A) aerosol B) emulsion C) sol D) gel An aerosol is a mixture where tiny liquid or solid particles are dispersed in a gas. 22 / 50 22. chmatsep_10 Any form of matter which contains a single substances is A) pure B) gas C) solid D) impure A pure substance consists of only one type of particle and has a uniform composition. Impure substances contain multiple components 23 / 50 23. chmatsep_16 which of the following is not a property of metals A) solid B) high boiling point C) reflect light D) low melting point Most metals have high melting points. While some non-metals can have low melting points, metals are usually solid at room temperature with higher melting points 24 / 50 24. chmatsep_25 one of the most abundand substances on the surface of the earth A) oxygen B) hydrogen C) sodium D) carbon Oxygen and silicon are the most abundant element in the Earth's crust and is essential for life. 25 / 50 25. chmatsep_2 what is the solvent in brass A) copper B) zinc C) iodine D) Tin Brass is an alloy primarily made of copper and zinc. In the context of alloys, the main component (in this case, copper) is considered the solvent, while the other metal (zinc) acts as the solute 26 / 50 26. chmatsep_31 What is a saturated solution A) a solution in which the solute is salt B) a solution of sand and water C) a solution in which solute can no more dissolve in solvent D) a solution in which the constituent is brine A saturated solution contains the maximum amount of solute that can dissolve at a given temperature. 27 / 50 27. chmatsep_46 Which of the following is not correct about solid A) can be compressed B) has definite shape C) diffuses slowly D) has definite volume Solids have a definite shape and volume and are generally not compressible. The particles in solids are closely packed and have fixed positions 28 / 50 28. chmatsep_37 which of the following is not a type of colloidal solution A) milk B) brine C) honey D) glue Brine is a solution, not a colloid. Honey, glue, and milk are colloidal solutions. 29 / 50 29. chmatsep_32 what I saturated solution of common salt is A) silica B) sand C) colloid D) brine Brine is a saturated solution of salt (sodium chloride) in water 30 / 50 30. chmatsep_5 A reaction in which a substance undergoes permanent change is A) physical B) isomerization C) chemical D) electrophoresis A chemical change results in the formation of new substances with different properties. This change is generally irreversible (e.g., burning wood). 31 / 50 31. chmatsep_50 When a liquid turns to gas at temperature lower than its boiling point it is called A) decantation B) vaporisation C) sedimentation D) evaporation Evaporation is the process where molecules at the surface of a liquid gain enough energy to transition into the gas phase at temperatures below the boiling point. 32 / 50 32. chmatsep_14 A substance formed when two or more elements combine in a fixed proportion in a chemical reaction A) isomer B) mixture C) hybrid D) compound A compound is a substance formed from two or more elements that are chemically bonded together in fixed ratios, unlike mixtures where the components retain their individual properties 33 / 50 33. chmatsep_35 The scattering of light by the colloids in a colloidal solution is called A) tyndall effect B) harmonic effect C) refraction effect D) saturated effect The Tyndall effect describes the scattering of light by particles in a colloid, making the path of the light visible. 34 / 50 34. chmatsep_6 which of the following is not a property of non-metals A) high density B) low boiling point C) most are gases D) poor conductor Non-metals generally have low densities compared to metals. Most non-metals are gases at room temperature, and those that are solid (like sulfur and phosphorus) are also less dense than metals 35 / 50 35. chmatsep_4 A reaction in which a substance undergoes temporary change is A) physical B) electrolysis C) isomerization D) chemical A physical change involves alterations in the state or appearance of a substance without changing its chemical composition (e.g., melting ice). The change can be reversed 36 / 50 36. chmatsep_23 The two classes of compounds are A) solid and gases B) organic and inorganic C) hydrocarbon and nonhydrocarbon D) metal and non-metals Compounds are generally classified into organic (containing carbon) and inorganic (typically lacking carbon) 37 / 50 37. chmatsep_11 a substance which cannot be broken down into a simpler substance by any chemical method is A) ion B) element C) neutron D) atom An element is a fundamental substance that cannot be decomposed into simpler substances through chemical reactions. Atoms and ions are components or forms of elements, but they are not standalone substances 38 / 50 38. chmatsep_26 one of the most abundand substances on the surface of the earth A) hydrogen B) silicon C) carbon D) sodium Silicon is the second most abundant element in the Earth's crust, primarily found in silicate minerals 39 / 50 39. chmatsep_3 what is the solute in steel A) iron B) carbon C) zinc D) copper Steel is an alloy primarily made of iron, with carbon as the solute. The carbon is dissolved in iron to improve its strength and hardness 40 / 50 40. chmatsep_13 What are the two classes of elements A) proton and electron B) metal and nonmetal C) hydrocarbon and nonhydrocarbon D) atom and nonatom Elements are generally classified into metals and nonmetals based on their physical and chemical properties. 41 / 50 41. chmatsep_44 which of the following is not an example of organic solvent A) water B) propanone C) alcohol D) turpentine Water is not considered an organic solvent; it is a polar solvent. Organic solvents include substances like propanone, alcohol, and turpentine. 42 / 50 42. chmatsep_39 The dispersion of solid in liquid where the solid is more dominant than the solvent is called A) emulsion B) gel C) aerosol D) sol A gel is a colloidal system where a solid is dispersed in a liquid, giving it a jelly-like consistency 43 / 50 43. chmatsep_45 which of the following is not an example of organic solvent A) turpentine B) oxygen C) propanone D) benzene Oxygen is a gas and not an organic solvent. Propanone and benzene are examples of organic solvents, while turpentine is also organic. 44 / 50 44. chmatsep_41 which of the following is not correct about diffusion A) the membrane is semipermeable B) the movement is from area of high concentration to area of higher concentration C) there is movement of particles across a membrane D) the particle that moves can be the solute or the solvent Diffusion is the process where particles move from an area of higher concentration to an area of lower concentration until equilibrium is reached. The statement is incorrect because it describes the opposite of how diffusion works 45 / 50 45. chmatsep_8 Anything that has space mass and occupies space is A) life B) neutron C) element D) matter Matter is anything that has mass and occupies space. It is the substance that makes up all physical objects in the universe. 46 / 50 46. chmatsep_34 A solution in which large quantity of solute dissolves in small quantity of solvent is A) concentrated B) diluted C) saturated D) colloid A concentrated solution has a high amount of solute relative to the amount of solvent 47 / 50 47. chmatsep_17 which of the following is not a property of metals A) high density B) poor conductor of electricity C) good conductor of heat D) high melting point Metals are excellent conductors of heat and electricity. This characteristic is crucial for their use in electrical applications 48 / 50 48. chmatsep_24 The states in which matter can exist include the following except A) liquid B) gas C) solid D) dense The three primary states of matter are solid, liquid, and gas. "Dense" is not a state of matter. 49 / 50 49. chmatsep_28 which of the following is not correct about a compound A) the constituents are combined by chemical means B) the constituents can be separated C) consists of two or more substances D) the constituents have been combined in definite fixed proportion A compound is a pure substance formed from two or more elements combined in fixed ratios, not just any combination of substances 50 / 50 50. chmatsep_18 which of the following is not a property of non-metals A) low density B) cannot be hammered C) cannot be stretched or drawn D) high boiling point Non-metals are generally brittle and cannot be easily shaped, unlike metals which can be stretched and drawn. However, some non-metals can exist in forms that can be molded. 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