This post contains multiple choice questions of Is Matter around us pure.
1. A sample of matter containing two or more substances is called a __.
(a) Mixture (b) Compound (c) Colloid (d) Suspension
2. Homogeneous mixtures are called __.
(a) Solute (b) Solvent (c) Solution (d) Colloid
3. Aqueous solutions of low molecular mass solutes are called __ solutions.
(a) right (b) true (c) colloid (d) wrong
4. Solution of iodine in alcohol is a __ solution.
(a) solid (b) aqueous (c) non-aqueous (d) liquid-liquid
5. Brass is a __ solution.
(a) Liquid (b) Solid (c) Gas (d) None of these
6. A saturated solution of alum when cooled gives __ of alum.
(a) Solution (b) Liquid (c) Crystals (d) Solvent
7. Muddy pond water containing particles of about 10-7 m radium is classified as __.
(a) True solution (b) Colloid (c) Suspension (d) None of these
8. The dispersed phase in a liquid aerosol is a __.
(a) Solid (b) Liquid (c) Gas (d) None of these
9. A solution containing 10 g of solute in 100 g of the solvent. Its concentration in terms of mass percentage is:
(a) 10.1 (b) 0.91 (c) 9.1 (d) 91
10. A pure substance can be:
(a) and element only (b) a compound only (c) either an element or a compound (d) neither an element not a compound
11. Which of the following is not a colloidal system?
(a) Smoke (b) Air (c) Latex (d) Haemoglobin
12. Which of the following statements is not true?
(a) True solutions are homogeneous (b) True solutions are transparent (c) Suspensions are heterogeneous (d) Colloidal particles can be separated by filtration
13. Which of the following statements is not true?
(a) True solutions are homogeneous (b) True solutions are transparent (c) Suspensions are heterogeneous (d) Suspension particles can not be separated by filtration
14. Which of the following statements is not true?
(a) True solutions are homogeneous (b) True solutions are opaque (c) Suspensions are heterogeneous (d) Suspension particles can be separated by filtration
15. Which of the following statements is not true?
(a) True solutions are heterogeneous (b) True solutions are transparent (c) Suspensions are heterogeneous (d) Suspension particles can be separated by filtration
16. Which of the following gives a translucent filtrate?
(a) Suspension (b) Solution (c) Colloid (d) None of these
17. In which of the following the dispersed phase is a gas and dispersion medium is a liquid?
(a) Emulsion (b) Gel (c) Soap lather (d) Liquid aerosol
18. A mixture having uniform properties throughout is __.
(a) Heterogeneous (b) Homogeneous (c) Both of them (d) None of these
19. A homogeneous solid mixture of two or more metals is called as __.
(a) Alloy (b) Mixture (c) Colloid (d) Aerosol
20. The solution of sulphur and carbon disulphide is:
(a) Aqueous solution (b) Colloidal solution (c) Non-aqueous solution (d) None of these
21. A solution containing solute particle having the size of about 0.1 nm is:
(a) True solution (b) Colloidal solution (c) Suspension (d) All of them
22. A solution which cannot dissolve the solute anymore, at fixed temperature, is:
(a) Saturated solution (b) Unsaturated solution (c) Supersaturated solution (d) None of them
23. The colloidal solution obtained from a tree is:
(a) Latex (b) Toothpaste (c) Fog (d) Fruit
24. Obtaining crystals of pure solid from its solution is called:
(a) Sedimentation (b) Crystallisation (c) Chromatography (d) Distillation
25. A colloidal solution having dispersed droplet of a liquid into a gas is:
(a) Emulsion (b) Aerosol (c) Sol (d) Foam
26. A system consisting of a dispersed liquid into another liquid is:
(a) Aerosol (b) Foam (c) Sol (d) Emulsion
27. Generic name of a colloidal solution is:
(a) Suspension (b) Emulsion (c) Sols (d) Foam
28. The substance that dissolve in a liquid to form a solution is called:
(a) Solvent (b) Solid (c) Foam (d) Solute
29. A homogeneous solution containing two or more metals is:
(a) Emulsion (b) Heterogeneous (c) Alloy (d) Emulsion
30. Magnetic separation is used for separating a __ material from a __ material.
(a) Magnetic, Magnetic (b) Magnetic, Non-magnetic (c) Non-magnetic, Non-magnetic (d) Non-magnetic, Magnetic
31. The components of a mixture containing two miscible liquid having different __ can be separated by distillation.
(a) Melting point (b) Boiling point (c) Freezing point (d) Chemical
32. The coloured component of a flower extract can be separated by __.
(a) Distillation (b) Fractional distillation (c) Chromatography (d) Decantation
33. A __ change is irreversible, while __ change is reversible.
(a) Physical, Chemical (b) Physical, Physical (c) Chemical, Chemical (d) Chemical, Physical
34. The boiling point of two components of a liquid mixture differ by more than 25 °C. These can be separated by:
(a) Distillation (b) Separating funnel method (c) Evaporation (d) Fractional distillation
35. A crude sample of iodine can be purified by:
(a) Distillation (b) Crystallisation (c) Sublimation (d) Centrifugation
36. Which of the following mixture cannot be separated by fractional distillation?
(a) Acetone+ Methanol (b) Chloroform + Benzene (c) Water + Ethanol (10%+90%) (d) Benzene + Toluene
37. Settling down of heavier coarser particle at the bottom of muddy water is:
(a) Decantation (b) Sedimentation (c) Chromatography (d) Winnowing
38. The process of separating grains from husk and hay with the help of wind is:
(a) Winnowing (b) Distillation (c) Magnetic separation (d) Sedimentation
39. A medium with fine pores to permit only a solvent or the solution is called:
(a) Notebook paper (b) Filter paper (c) Carbon paper (d) None of them
40. How is common salt obtained from sea or lake water on commercial scale?
(a) Condensation (b) Distillation (c) Evaporation (d) Sedimentation
41. When the substances X and Y are made to react to form a new substance Z, the following observations were made:
(i) During the reaction between X and Y, a large amount of heat is evolved.
(ii) The properties of Z are different from those of X and Y.
What type of substance is Z?
(a) Heterogeneous mixture (b) Element (c) Homogeneous mixture (d) Compound
42. Separating the smaller, lighter particles from the liquid by rotating is:
(a) Centrifugation (b) Sedimentation (c) Decantation (d) Chromatography
43. Separating the coloured components of a mixture by using a paper strip for a column is:
(a) Centrifugation (b) Sedimentation (c) Decantation (d) Chromatography
44. Removing the insoluble impurities present in a solution by using a filter paper is:
(a) Distillation (b) Filtration (c) Centrifugation (d) Decantation
45. Conversion of solid directly into its vapour by heating is:
(a) Sedimentation (b) Centrifugation (c) Distillation (d) Sublimation
46. The purity of any substance can be checked by:
(a) Melting point (b) Boiling point (c) Refractive index (d) All of these
47. The substances present in a mixture are called __ of the mixture.
(a) Components (b) Constituents (c) Both of them (d) None of them
48. Alloys are mixtures of two or more metals or a metal and a non-metal because __.
(a) They don’t have any fixed composition
(b) They show the properties of their constituents
(c) Only (a) is correct
(d) Both are correct
49. Which of the following is incorrect?
(a) In mixtures, the constituents may be present in any proportion.
(b) Mixtures, including solutions, are heterogeneous.
(c) The components of a mixture can be separated by simple physical methods.
(d) Mixtures show the properties of all the components present in it.
50. Brass is a __ solution, containing __ copper and __ zinc.
(a) Solid, 52%, 48%
(b) Solid, 70%, 30%
(c) Liquid, 70%, 30%
(d) Solid, 30%, 70%
51. Homogeneous solution of a solid into another solid is called __ solution.
(a) Liquid (b) Gas (c) Solid (d) None of these
52. What is solute and solvent in ethanol in water?
(a) Solute is ethanol and solvent is water
(b) Both solute and solvent is ethanol
(c) Solute is water and solvent is ethanol
(d) Both solute and solvent is water.
53. Which of these is an example of aqueous solution?
(a) Solution of carbon dioxide in water
(b) Solution of sulphur in carbon disulphide
(c) Solution of iodine in carbon tetrachloride
(d) Solution of iodine in alcohol (tincture of iodine)
54. An aqueous solution is expressed by a short form __.
(a) s (b) l (c) g (d) aq
55. ppm is short form for:
(a) Parts per million (b) Parts per millimetre (c) Parts per mass (d) Parts per metre
56. The unit of mass by volume percentage may be expressed as:
(a) gram per ml (b) gram per litre (c) kilogram per litre (d) All of them
57. A solution in which more solute could be dissolved at any fixed temperature is called:
(a) Saturated solution (b) Supersaturated solution (c) Unsaturated solution (d) True solution
58. A solution containing more solute than that required to prepare a saturated solution at any fixed temperature is called:
(a) Supersaturated solution (b) Saturated solution (c) Unsaturated solution (d) Colloidal solution
59. Muddy pond water, Chalk water mixture are examples of:
(a) True solution (b) Colloidal solution (c) Suspension (d) None of these
60. What is the size of colloidal particles?
(a) Between 1-100 nm (b) Greater than 100 nm (c) Smaller than 1 nm (d) Greater than 10-7 m
61. Milk and blood are example of:
(a) True solution (b) Colloidal solution (c) Suspension (d) None of these
62. Brownian movement is shown by:
(a) Colloidal solution (b) Suspension (c) True solution (d) None of these
63. The movement of colloidal particles under the influence of electric field is called:
(a) Electrolysis (b) Electrophoresis (c) Brownian movement (d) Tyndall effect
64. The constituents of a mixture are separated for the following given purpose, which of the following is incorrect?
(a) To remove any harmful or undesirable constituents
(b) To obtain a pure sample of a substance
(c) To obtain useful constituents
(d) To obtain impure sample of a substance
65. Which of the following given compounds does not undergo sublimation?
(a) Camphor (b) Ammonium chloride (c) Naphthalene (d) Sugar
66. Magnetic materials can be separated from non magnetic materials by:
(a) Sedimentation (b) Filtration (c) Gravity method (d) Magnetic separation method
67. __ and __ are used for separating coarse particles of a solid which is insoluble in any liquid.
(a) Sedimentation and Decantation (b) Decantation and Filtration (c) Magnetic separation and Sedimentation (d) Filtration and Sublimation
68. Pure solid can be obtained from its a sample by:
(a) Decantation (b) Crystallisation (c) Evaporation (d) Sedimentation
69. Liquids which do not dissolve in each other are called immiscible liquids and can be separated by using:
(a) Filter paper (b) Separation funnel (c) Beaker (d) Centrifugation machine
70. The particles which are very small and can easily pass through filter paper, can be separated by:
(a) Centrifugation (b) Sedimentation (c) Separating funnel (d) Filter paper
71. Which of the following is not the application of centrifugation?
(a) Used in washing machine to squeeze out water from wet clothes
(b) Used for separating cream from milk and butter from curd
(c) Used in diagnostic laboratories for testing blood or urine
(d) Used for separating two immiscible liquids such as oil and water.
Answers:
1. (a) Mixtures
2. (b) Solution
3. (b) true
4. (c) non-aqueous
5. (b) Solid
6. (c) Crystals
7. (c) Suspension
8. (b) Liquid
9. (c) 9.1
10. (c) either an element or a compound
11. (b) Air
12. (d) Colloidal particles can be separated by filtration
13. (d) Suspension particles can not be separated by filtration
14. (b) True solutions are opaque
15. (a) True solutions are heterogeneous
16. (c) Colloid
17. (d) Liquid Aerosol
18. (b) Homogeneous
19. (a) Alloy
20. (c) Non-aqueous solution
21. (a) True solution
22. (a) Saturated solution
23. (a) Latex
24. (b) Crystallisation
25. (b) Aerosol
26. (d) Emulsion
27. (c) Sols
28. (d) Solute
29. (c) Alloy
30. (b) Magnetic, Non-magnetic
31. (b) Boiling point
32. (c) Chromatography
33. (d) Chemical, Physical
34. (a) Distillation
35. (c) Sublimation
36. (c) Water + Ethanol (10% + 90%)
37. (b) Sedimentation
38. (a) Winnowing
39. (b) Filter paper
40. (c) Evaporation
41. (d)Compound
42. (a) Centrifugation
43. (d) Chromatography
44. (b) Filtration
45. (d) Sublimation
46. (d) All of these
47. (c) Both of them
48. (d) Both are correct
49. (b) Mixtures, including solutions, are heterogeneous.
50. (b) Solid, 70%, 30%
51. (c) Solid
52. (a) Solute is ethanol and solvent is water
53. (a) Solution of carbon dioxide in water
54. (d) aq
55. (a) Parts per million
56. (d) All of them
57. (c) Unsaturated solution
58. (a) Supersaturated solution
59. (c) Suspension
60. (a) Between 1-100 nm
61. (b) Colloidal solution
62. (a) Colloidal solution
63. (b) Electrophoresis
64. (d) To obtain impure sample of a substance
65. (d) Sugar
66. (d) Magnetic separation method
67. (a) Sedimentation and Decantation
68. (b) Crystallisation
69. (b) Separation funnel
70. (a) Centrifugation
71. (d) Used for separating two immiscible liquids such as oil and water.
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