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Question

Which of the following is not a constituent of air?

A
Oxygen
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B
Gold
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C
Nitrogen
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D
Carbon dioxide
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Solution

The correct option is B Gold
The air in our atmosphere is composed of different gases. It contains 78% of nitrogen, 21% of nitrogen and 1% of other gases including carbon dioxide.

Gold is a metal present in the earth's crust. It is not a constituent of air.

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