Page 95 - ICSE Chemistry 6

4. Name two substances that are soluble and two substances that are insoluble in water.
5. Why is the forma on of a solu on a physical change?

6. What is typhoid?
7. What causes dysentery? What are its symptoms?

8. Why should we not use water present in rivers, lakes, etc. for consump on directly?

AT LENGTH

A. Explain the following terms.

1. Groundwater 2. Water table 3. Solute 4. Solu on
5. Saturate solu on 6. Unsaturated solu on 7. Loading 8. Potable water

B. Diff eren ate between the following.

1. Spring water and well water
2. Saturated solu on and unsaturated solu on

3. Filtra on and dis lla on
4. Sedimenta on and decanta on

5. Water purifi er and RO system

C. Answer in detail.

1. What are the major sources of water? Discuss each.
2. Write a note on the states of water.
3. Explain water cycle in detail.

4. Explain anomalous expansion of water.
5. In what all ways is water important for humans and plants?

6. Men on some other uses of water.
7. Explain the condi ons on which the forma on of a solu on depends.
8. How will you prepare a saturated solu on of salt and water?

9. With the help of an ac vity, show that salt can be separated from the salt solu on.
10. What is dis lla on? Write the uses of dis lled water.
11. Write the characteris cs of potable water.

12. Write about the following diseases: diarrhoea, gastroenteri s and cholera.
13. What is purifi ca on of water? Explain some commonly used methods of water purifi ca on.
14. How can we conserve water?

15. What is water pollu on? What are the major causes of water pollu on? Discuss a few ways of
preven ng water pollu on.
16. Write a note on fl oods and droughts.

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