Gaseous StateHard

Question

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

Options

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

Solution

Vrms ∝ ′M′ is Molecular wt.
   order of M.wt. = H2 <  N2 < O2 < HBr
∴ order of  Vrms = H2 > N2 > O2 > HBr.

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