IMPORTANT QUESTIONS CLASS 9 Chapter 2

Very Short and Short Answer Type Questions

1. What are colloids? Give examples.
2. What are emulsions? Give examples.
3. What are sols? Give examples.
4. Define Aqueous and non-aqueous solutions.
5. Give an example of liquid in a liquid solution.
6. Write down the properties of compounds.
7. What is a saturated solution? Give examples.
8. If 50 ml of acetone is present in 150 ml of its aqueous solution, calculate the concentration of the solution.
9. What is the difference between a homogenous and heterogeneous mixture?
10. Describe a method to separate a mixture of sand and salt.
11. Name the process by which you can separate a mixture of water and alcohol.
12. Explain the process of centrifugation.
13. Name any two solid substances whose mixture can be separated by sublimation.
14. Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they settle down.
15. State the principle of separating two immiscible liquids by using a separating funnel.
16. What is the effect of temperature and pressure on solubility?
17. What are metals and non-metals? Give examples.
18. What do you mean by malleable and ductile?
19. Why Iron is used in the construction of buildings, bridges etc?
20. Name two soft and hard metals each.

Long Answer Type Questions

1. What is Chromatography? Give its applications.
2. Distinguish between a physical change and chemical change.
3. Describe any three properties of colloids.
4. Differentiate between a true solution and a colloid.