All of the following are gases and not vapour, except

Nitrogen

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Oxygen

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Polar aurorae

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Steam

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Solution

The correct option is D Steam
A gas is a substance which exists in the gaseous state at the room temperature. A substance present in the liquid state at the room temperature can be converted into the gaseous state by heating. The gaseous state of this substance is referred to as vapour. When water is heated, it changes into vapour and is known as steam.
Hence, the correct answer is option (d).

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