Q.

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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a

He, O2 and NH3

b

NH3, H2 and O2

c

NH3, O2 and He

d

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