Which of the following statement is true about air?
1.Air is a mixture of several types of gases.
2.The composition of air is constant in the atmosphere.

Both i and ii

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Only i

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Only ii

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Solution

The correct option is A
Both i and ii

Air is a mixture of many gases, dust particles and water vapour.

Nitrogen is the major component. It constitutes 78% of the air by volume.Oxygen constitutes 21% of air by volume.

Air has 0.03% carbon dioxide present in it.

So the air is a mixture of several types of gases like nitrogen,oxygen, carbon dioxide, noble gases and many other gases.

The composition of air is constant in the atmosphere.

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