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Question

Which of the following represents the correct composition of air by volume?


A

Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

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B

Nitrogen - 60%, oxygen - 38% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

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C

Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

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D

​Nitrogen - 38%, oxygen - 60% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.

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Solution

The correct option is C

Nitrogen - 21%, oxygen - 78% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.


The composition of air by volume is:

Nitrogen - 78%, oxygen - 21% and other gases such as carbon dioxide, argon, methane, ozone and water vapour are present in small quantities.


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