Q.

Which of the following statements is correct about water vapours in the air?

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a

 It is a greenhouse gas.

b

Air has at least 10% of water vapour.

c

The amount of water vapour is constant in the air.

d

 Water vapour has no particular role to play in the air.

answer is A.

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Detailed Solution

Water vapour is a greenhouse gas and thus it traps the heat of the sun coming toward the earth. It also absorbs the heat from the earth and thus it maintains the temperature of the earth.

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