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Question

Select the incorrect statement with respect to the composition of clean air.

A
Nitrogen makes 78% of the air
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B
Oxygen makes 21% of the air
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C
Carbon dioxide makes 1% of the air
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D
Argon makes 0.9% of the air
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Solution

The correct option is C Carbon dioxide makes 1% of the air
The clean, dry air consists mainly of nitrogen at 78 per cent and oxygen at 21 per cent by volume. The remaining 1 per cent consists of a mixture of other gases, like argon at 0.9 per cent, along with traces of carbon dioxide, methane, hydrogen, helium, and water vapour.

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