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Question

Which of these constituents present in air leads to the formation of fog and mist?

A
Nitrogen
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B
Oxygen
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C
Water vapour
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D
Carbon dioxide
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Solution

The correct option is C Water vapour
Fog or mist a thick covering of water droplets that looks like clouds on the ground level. The presence of water vapour in air leads to the formation of fog and mist at a suitable temperature. Mist is tiny droplets of water hanging in the air. These droplets form when warmer water in the air is rapidly cooled, causing it to change from invisible gas to tiny visible water droplets.

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