Fill in the blanks:

(a) Water is a …………… solvent.

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

(c) Sand and dust are …………… impurities in water.

(d) Sea water has a high concentration of ……………

(e) Water covers nearly …………… of the surface of the earth.

(f) Evaporation of rain water leaves …………… residue.

(g) …………… is the chemical added to water to remove the tiny suspended particles.

(h) A …………… is a uniform mixture of a solute and a solvent.

(i) Ice, water and steam have different physical states but are chemically ……………

(j) Boiling kills most of the …………… in water.

(k) The elements present in the molecules of water are …………… and ……………

Write true or false for the following statements:

(a) Water is an element. ……………

(b) Alum is commonly used for removing suspended impurities. ……………

(c) Tap water does not contain dissolved impurities. ……………

(d) Distillation is a good method for purifying water for town supply. ……………

Name two water-borne diseases.

What are effluents?