Question

Which of the following is NOT present in air?

Answer 1

The component which is not present in air is Chlorine. Explanation: Air is a mixture of various 'gases and water vapour'. Its composition changes with altitude and pressure.

Answer 2

The whole question is as follows:

Which of the following is NOT present in air?

(a) Oxygen

(b) Nitrogen

(c) Helium

(d) Iron

Answer:

The correct answer is (d) Iron which is not present in the air.

Explanation:

• Air is a mixture of the invisible gases which surround the Earth.
• Sometimes, the word 'Atmosphere' is also used for air.

• Air contains 78% Nitrogen, 21% Oxygen, 1% other gases like carbon dioxide, argon, helium, smoke, dust particles and water vapor.

• While iron is a metal, not a gas, so it is not present in the air.

So, iron is not present in the air.

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