Which of the following statement is true about air? Options: A . &nbspIt is opaque. B . &nbspIt is made up of only one substance. C . &nbspIt contains water vapour. D . &nbspIt contains 70% of oxygen.

Which of the following statement is true about air?

Question

Which of the following statement is true about air?

Options:

A . It is opaque.

B . It is made up of only one substance.

C . It contains water vapour.

D . It contains 70% of oxygen.

Answer: Option C
:
C
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:

Which Of The Following Statement Is True About Air?

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