Gas that constitutes nearly 21% of air by volume is .

carbon dioxide

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nitrogen

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oxygen

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Solution

The correct option is C 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.

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Gas that constitutes nearly 21% of air by volume is .

The correct option is C oxygenAir 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.

The correct option is C 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.