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Study Material for Class 9 Science Chapter 2 Is Matter Around Us Pure
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Class 9 Science Chapter 2 Is Matter Around Us Pure
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1. Salt can be recovered from its solution by evaporation. Suggest some other technique for the same?
2. While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C). What technique can be employed to get back the acetone? Justify your choice.
3. Classify the following as element, compound or mixture. i) Zinc amalgam (ii) Sea water (iii) Iodine vapour (iv) Gold coin (v) Water.
4. How would you separate a mixture of ammonia and hydrogen?
5. Give one example for each of the following mixtures: i) Solid/solid (homogeneous) ii) Solid/solid (heterogeneous) iii) Liquid/liquid (homogeneous) iv) Liquid/liquid (heterogeneous) v) Gas/liquid (homogeneous).
6. Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do.
7. Smoke and fog both are aerosols. In what way are they different?
8. Name the process associated with the following
(a) Dry ice is kept at room temperature and at one atmospheric pressure.
(b) A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
(c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.
(d) A acetone bottle is left open and the bottle becomes empty. (e) Milk is churned to separate cream from it.
(e) Settling of sand when a mixture of sand and water is left undisturbed for some time.
(f) Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths.
9. The teacher instructed three students ‘A’, ‘B’ and ‘C’ respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). ‘A’ dissolved 50g of NaOH in 100 mL of water, ‘B’ dissolved 50g of NaOH in 100g of water while ‘C’ dissolved 50g of NaOH in water to make 100 mL of solution. Which one of them has made the desired solution and why?
10. Why is gold alloyed with copper or silver for the purpose of making ornaments?
11. Give some examples of Tyndall effect observed in your surroundings?
12. Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water?
14. Action of heat on blue vitriol is a physical as well as chemical change. Justify.
15. How would you separate a mixture of NH4Cl and I2?
16. Describe a method for separation of the constituents of gunpowder.
17. Describe how you would obtain the substances mentioned below, from the given mixtures.
a) Iodine from tincture of iodine. b) Lead chloride from a mixture of lead chloride and silver chloride
18. Write the characteristics of Suspension method of separation of mixture.
19. Briefly describe how to separate, i) Sulphur from a mixture of sulphur and sand. ii) Black CuO from a mixture of CuO and ZnO.
20. Fill in the blanks
(a) A colloid is a ——— mixture and its components can be separated by the technique known as ———.
(b) Ice, water and water vapour look different and display different —— properties but they are ——— the same.
(c) A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of——— and the lower layer will be that of ———.
(d) A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called———.
(e) When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the ——— of light by milk and the phenomenon is called — —— . This indicates that milk is a ——— solution.
21. Which of the following is NOT true about colloids?
(a) Particles in a colloid can pass through filter paper.
(b) A colloid is a homogeneous solution.
(c) Colloidal particles exhibit Brownian motion.
(d) Colloidal particles exhibit electrophoresis.
22. Which of the following is a heterogeneous mixture?
(a) air
(b) brass
(c) sugar dissolved in water
(d) lime water
23. How can we separate cream from milk?
(a) Centrifugation
(b) Chromatography
(c) Sublimation
(d) Distillation
24. Removal of clear layer of the liquid without disturbing the settled solid is known as
__________.
(a) Sedimentation
(b) Decantation
(c) Filtration
(d) Evaporation
25. A mixture of water and silver chloride can be separated by
(a) Centrifugation
(b) Sedimentation
(c) Filtration
(d) Sublimation
26. When two liquids in a mixture differ by their boiling points, which of the following is the
best method to separate these liquids?
(a) Evaporation
(b) Distillation
(c) Chromatography
(d) Filtration
27. Solution which has uniform composition throughout is called ___________.
(a) homogeneous solution
(b) heterogeneous solution
(c) Colloidal solution
(d) none of these
28. The particles of a suspension will be of size ________
(a) less than 1nm (nm = nano metre)
(b) between 1nm to 100 nm
(c) greater than 100nm
(d) less than 0.1 nm
29. Which of the following is a chemical change?
(a) Melting of ice
(b) Dissolving salt in water
(c) Rusting of iron
(d) Boiling of water into steam
30. Which one of the following is TRUE for compounds?
(a) It shows properties of its constituents.
(b) It may be homogeneous or heterogeneous.
(c) It can be separated by physical methods.
(d) It has fixed melting and boiling point.
Please click the link below to download CBSE Class 9 Science Is matter around us pure Sure Shot Questions B.
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CBSE Class 9 Science Chapter 2 Is Matter Around Us Pure Study Material
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