Which one of the following observations in daily life shows the presence of water vapour in the air?

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Melting of ice

Freezing of ice

Droplets of water on the surface of water bottle taken out from the refrigerator

Drying of clothes

answer is C.

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Detailed Solution

The observation that shows the presence of water vapour in the air is the droplets of water appearing on the surface of a water bottle taken out from the refrigerator.
When we take out a water bottle from the refrigerator and keep it outside for some time, we can observe droplets of water on the surface of water bottles. This happens because the vapours present in the air come in contact with the cool surface of the water bottle and cool down, further condensing to form droplets. Condensation is the process of conversion of gases into liquid on cooling.

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