Which gas constitutes nearly 21% of air by volume?

Oxygen

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Nitrogen

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Hydrogen

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Argon

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Solution

The correct option is A Oxygen
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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