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Question
If you take ice cold water in a glass tumbler, you will observe some water droplets on its outer surface. What can we infer from this?
Options:
A .  Air occupies space.
B .  Air contains nitrogen gas.
C .  Air contains water vapour.
D .  Air contains oxygen gas.
Answer: Option C
:
C
Air is a mixture of many gases. It also contains a small percentage of water vapour (gaseous state of water). When the water vapour present in the air comes in contact with the tumbler containing cold water, it condenses to form tiny droplets on the outer surface of the tumbler.

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