The internal energy of gases He, O2 and NH3 are plotted against the absolute temperature. The respective graphs 1, 2 and 3 are of

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He, O2 and NH3

NH3, H2 and O2

NH3, O2 and He

O2, He and NH3

answer is A.

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Detailed Solution

The internal energy U=f2RT and fNH3>fO2>fHe where f is degrees of freedom

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