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Q.

At STP,  the correct order of root mean square velocity of molecules of H2, N2, O2 and HBr is

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a

N2 > HBr > O2 > H2

b

H2 > N2 > O2 > HBr

c

HBr > H2 > O2 > N2

d

H2 > O2 > HBr > N2

answer is B.

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Detailed Solution

At same temperature lower the molar mass higher is the RMS velocity.C=3RTM; C ∝1M ;
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At STP,  the correct order of root mean square velocity of molecules of H2, N2, O2 and HBr is