Who am I?

(a) I am found in clouds and mist.

(b) I am used in aerated drinks.

(c) I am used in an electric bulb.

(d) I form 78% of air.

(e) I am used in the production of nitric acid.

(a) Water vapour

Explanation:

Clouds and fogs are formed by the condensation of water vapour.

(b) Carbon dioxide

Explanation:

Carbon dioxide is used in aerated drinks. When you open the cap of a drink, you can see the pressure gushes out of the bottle. That pressure is only due to the carbon dioxide present in it.

(c) Inert gas (Argon)

Explanation:

Inert gas like argon gas is used in electric bulbs. As soon as the electricity flows into the blub, it heats the tungsten wire filament.

Note: Inert gas is gas which does not react and burn in any way.

(d) Nitrogen

Explanation:

Nitrogen is the only constituent which contains 78% of air. It is one of the important constituent of air.

(e) Nitrogen

Explanation:

Nitrogen is used in industry for the large-scale production of nitric acid (HNO₃)