Name three water borne diseases.

Give reasons:

Alcohol is mixed with water and is used in car radiators.

Give reasons:

Carbonated drinks are bottled under high pressure.

Fill in the blanks:

(a) Water has ………………… density and …………….. volume at 4°C.

(b) Freezing mixture contains ……………… and ……………. .

(c) The solubility of a gas in water …………….. with rise in temperature and ………………….. with rise in pressure.

(d) ………………. is the purest form of natural water.

(e) Use of excessive ……………… by farmers causes water pollution.

(f) Boiling removes the ………………. hardness of water.

(g) Water turns the colour of anhydrous copper sulphate ………………. .

(h) The sticky substance formed when soap is added to hard water is …………………. .