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Question

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

A
H2 > N2 > O2 > HBr
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B
HBr > O2 > N2 > H2
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C
HBr > H2 > O2 > N2
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D
N2 >O2 > H2 > HBr
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Solution

The correct option is A H2 > N2 > O2 > HBr
As we know,

Urms = 3RTMw

Molecular weight order

H2 < N2 < O2 < HBr
2 28 32 81
So, rms speed order is

H2 > N2 > O2 > HBr

Hence, the correct option is A

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