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

CBSE Class 9 Science Is matter around us pure Sure Shot Questions B. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

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?

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