At a given temperature the $r.m.s.$ velocity of molecules of the gas is
A
Same
B
Proportional to molecular weight
C
Inversely proportional to molecular weight
D
Inversely proportional to square root of molecular weight
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D
Inversely proportional to square root of molecular weight
d ${v_{rms}} = \sqrt {\frac{{3RT}}{M}} $ $\Rightarrow$ ${v_{rms}} \propto \frac{1}{{\sqrt M }}$
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