Give one word/words for the following statements:

(a) Water fit for human consumption.

(b) The harmful substances dissolved in water.

(c) The change of states of water from one form to another.

(d) The gaseous form of water found in air.

(e) A mixture of common salt and ice.

(f) A substance which does not contain water in its chemical structure.

(g) A property due to which a substance absorbs water without dissolving.

(h) Water molecules in loose chemical combination with other substances.

Two gases found dissolved in natural water are

1. oxygen and carbon dioxide
2. hydrogen and oxygen
3. sulphur dioxide and hydrogen
4. chlorine and ammonia

Temporary hardness of water can be removed by

1. filtering
2. boiling
3. loading
4. none of the above

Colloids have the particle size ranging between

1. 10^-7 to 10^-10 m
2. 10^-10 to 10^-12 m
3. 10^-7 to 10^-5 m
4. 10^-12 to 10^-15 m