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Question

Degree of freedom of unknown gas is 3. The gas can be

A
H2
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B
O2
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C
CO2
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D
He
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Solution

The correct option is D He
We know that, monoatomic gases have 3 degrees of freedom and diatomic and triatomic gases have more than 3 degrees of freedom.
Therefore, the given gas must be a monoatomic gas.
In the given options only He is a monoatomic.
Therefore, correct option is (d) Helium.

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