CBSE Class 9 Science Is matter around us pure Sure Shot Questions A

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1. On the basis of composition, how matter is classified?

2. Mention whether the following statements are true or false. Correct the false statements.

   a) An aqueous solution of copper sulphate is homogeneous.

   b) Milk is a pure substance.

   c) A molecule of sulphur is monoatomic.

3. What is meant by a pure substance?

4. What are the characteristics exhibited by a pure substance?

5. What are different categories of pure substance?

6. Name two properties of a substance to check its purity?

7. Define mixture.

8. What are the kinds of mixture?

9. What are the characteristics of mixture?

10. List the points of differences between homogeneous and heterogeneous mixtures.

11. Identity which of the following is homogenous mixture or heterogeneous one. Also identify the type of constituents in mixture (e.g. gas in gas, gas in liquid, gas in solid etc.)

   a. Air

   b. Water and Oil (N₂ + O₂ )

   c. Hydrogen in Palladium

   d. Aerated Water (CO₂ + H₂O)

   e. Chalk in water

   f. Ethyl Alcohol in Water

   g. Alloys e.g. brass

   h. Dust (e.g. fine sand) in water

   i. Sand + iron fillings

   j. Sand + ammonium chloride

   h. milk

   i. Mercury in amalgamated Zinc

12. What are the constituents of brass?

13. Alloys cannot be separated by physical means, though it is considered mixture, Why?

14. What are elements?

15. How elements are further classified?

16. What is a compound? Give an example.

17. State the differences between compounds and mixtures.

18. What is a solution? What are the properties of a solution?

19. What is meant by solute and solvent?

20. Identify solute and solvent in the following solutions. Also mention the physical state of solute and solvent.

(a) Sugar in water

(b) Urea in water

(c) Ammonium chloride in water

(d) Ethyl alcohol in water

(e) Carbon Di-Oxide in water (soda water)

21. What is meant by Solubility?

22. What factors affect the solubility of solvent and solute?

23. Why do fish go in deep waters during day light?

24. Based on the type of solvent, how solutions are classified?

25. Based on the amount of solute in the given solution, how solutions are classified?

26. What are aqueous solutions?

27. What are non-aqueous solutions?

28. When we open the cap of a cola drink (or any carbonated beverage), why does excess of bubbles come out?

29. Why air is a mixture not a compound? Give reasons.

30. What are the advantages of preparing solutions?

31. What is an unsaturated solution?

32. What is saturated solution? Explain with an example.

33. What is supersaturated solution?

34. What are suspensions? Explain with an example.

35. What are the properties of suspensions?

36. Explain with an example what is a colloid?

37. What are the physical states of dispersed phase and dispersion medium of a cloud?

38. What are the physical states of dispersed phase and dispersion medium of a fog?

39. What are the properties of a colloid?

40. How are sol, solution and suspension different from each other?

41. What is Tyndall effect? Doee true solution exhibit Tyndall effect.

42. "Tyndall effect can be observed when sunlight passes through the canopy of dense forest. or we see a rich red sunset." Explain how this occurs

43. What do you mean by strength of the solution?

44. What are the various methods to express concentration of a solution?

45. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293K. Find its concentration at this temperature.

46. Calculate the mass of glucouse and mass of water required to make 200g of 25% solution of glucouse.

47. A solution contains 40 mL of ethyl alcohol mixed with 100mL of water. What is the concentration of the solution in terms of volume by volume percentage?

48. What are different ways to separate solid mixtures?

49. Describe sieving method.

50. Winnowing works on what property?

51. What are the reasons for separating the constituents of a mixture?

52. When it is useful to apply sedimentation and decantation? Give an example where these methods are used? Explain the process.

53. What principle is applied in centrifugation? Give examples where this method is applied to separate mixtures.

54. How crystallization is better than evaporation?

55. Name the technique to separate (i) butter from curd (ii) salt from sea-water (iii) camphor from salt

56. What is Chromatography?

57. A good method to separate alum (phitkari) from impure samples is (a) Filtration (b)

Sedimentaion (c) Crystallization (d) Sublimation

58. A boy buys common salt from the market which is contaminated with Ammonium Chloride (NH4Cl) and sand. The procedure he should adopt to obtain pure NaCl is the
following :

(a) to mix the sample in water and evaporate the solution

(b) to mix the sample in water and evaporate the decanted solution

(c) to mix the sample in acetone and evaporate the decanted solution

(d) to heat the sample, then mix in water and evaporate the decanted solution

59. Define Brownian movement in colloids.

60. Name the following :

(a) a lustrous liquid metal.

(b) a liquid non-metal

(c) a metal which can be cut with a knife

(d) a non-metal which is good conductor of electricity.

(e) an element which melts when kept on the palm.

(f) the best conductor of heat.

61. How many elements are there which are in gaseous state at room temperature?

62. Name the elements are in liquid state at room temperature.

63. Who used the term 'element' first time?

64. Who gave the first explanatory definition of 'element'?

65. Identify the following as mixture or compound. (i) blood (ii) common salt (iii) sugar (iv) brass

66. Sasha heats a container carrying Nitrogen and Oxygen. After heating at very high temperature, it gives Nitric oxide. Identify what are mixtures and/or compounds before and after the reaction.

67. In beaker A, sugar cubes are dissolved into water while in beaker B, crushed cubes are taken. In which beaker the rate of dissolution is faster?

68. Identify solute and solvent in the following solutions :

(i) aerated drinks

(ii) tincture of iodine

69. State the principle of each of the following methods of separation of mixtures.

(i) centrifugation method.

(ii) separation using separating funnel.

70. Why solutions do not exhibit Tyndall effect?

71. What is an emulsion? Give examples
72. What are the differences and similarities between concentration and solubility?

73. Give examples of liquids that are
(i) completely miscible
(ii) partially miscible
(iii) practically immiscible

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