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Q.

Two flask A and B of equal volumes maintained at temperature 300 K and 700 K contain equal mass of He(g) and N 2(i) respectively. What is the ratio of translational kinetic energy of gas in flask A to that of flask B?

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a

1 : 3

b

3 : 1

c

3 : 39

d

None of these

answer is B.

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Detailed Solution

Moles ratio =nHenN2=w/4w/28=71Ratio of translational K.E.=nHe⋅THenN2⋅TN2=71×300700=3:1
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