Q.

The presence of which of these components in air varies from place to place?


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a

Oxygen

b

Nitrogen

c

Carbon dioxide

d

Water vapour 

answer is D.

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Detailed Solution

The presence of water vapour in the air varies from place to place.
Air is a mixture of gases. It is composed of 78% nitrogen, 21%oxygen and 1% carbon dioxide and other gases and water vapour, dust and smoke. The water is present in the air in the form of water vapour. The amount of water vapour in the air is called humidity. The amount of water vapour varies from place to place. It is not the same everywhere.
 
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