Which gas constitutes nearly 21 of air by volume Oxygen

Which gas constitutes nearly 21 of air by volume Oxygen
| Which gas constitutes nearly 21% of air by volume?

A. Oxygen 

B. Nitrogen

C. Hydrogen

D. Argon

Please scroll down to see the correct answer and solution guide.

Right Answer is: A

SOLUTION

Air is a mixture of several gases, water vapour and dust particles. It mainly consists of gases namely nitrogen (78%), oxygen (21%), argon (0.9%), carbon-dioxide (0.03%) and water vapour. Composition of air is as follows:

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