The gas which adds taste to water is:

1. oxygen
2. nitrogen
3. hydrogen
4. carbon dioxide

Distilled water is:

1. salty
2. sweet
3. sour
4. tasteless

Name:

(a) Two chemicals used to destroy germs present in water.

(b) Two diseases which spread through impure water.

(c) A chemical used for loading.

(d) Two substances which add taste to water.

(e) Two household methods to get safe drinking water.

Define:

(a) Sterilisation

(b) Sedimentation

(c) Loading

(d) Aeration