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Substances and Their States

Which of the ...

Question

Which of the following statement is true about air?

A

It is opaque.

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B

It is made up of only one substance.

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C

It contains water vapour.

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D

It contains 70% of oxygen.

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Solution

The correct option is C It contains water vapour.
Air is a mixture of invisible gases, that surrounds the earth. 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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