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Q.

In a jar having a mixture of H2 and He

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a

Hydrogen has more mean KE per molecule

b

Helium has more mean KE per molecule

c

Both have same mean KE per molecule

d

Both have same internal energy

answer is A.

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Detailed Solution

Average K.E. per molecules of an ideal gas = 1/2 fKT.At ordinary temperature, f = 5 for H2 and f = 3 for He.
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