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Q.

A rigid container contains a mixture of one mole of nitrogen to two moles of He at 0oC. Then the ratio of rotational kinetic  energy per N2 molecule to the transational kinetic energy per He molecule is

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a

3 : 2

b

3 : 1

c

1 : 2

d

2 : 3

answer is D.

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Detailed Solution

For N2 molecule, number of degrees of freedom for rotational motion is 2 and for He molecule, number of degrees of freedom for translational motion is 3.∴ The required ratio =2.KT23.KT2=23
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