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Increasing order of rms velocities of $\mathrm{H}_{2}, \mathrm{O}_{2}, \mathrm{~N}_{2}$ and $\mathrm{HBr}$ is
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The correct answer is:
$\mathrm{HBr}<\mathrm{O}_{2}<\mathrm{N}_{2}<\mathrm{H}_{2}$
RMS velocity of molecules depends on mass. If mol. wt. increases, rms velocity of melocules decreases. $\mathrm{rms} \propto \frac{1}{\sqrt{\mathrm{m} \cdot \mathrm{wt}}}$
The order of increasing $\mathrm{m} . \mathrm{wt}$. is
$\mathrm{H}_{2}<\mathrm{N}_{2}<\mathrm{O}_{2}<\mathrm{HBr}$
Order of $V_{\mathrm{mx}}$ of molecules. $\mathrm{HBr}<\mathrm{O}_{2}<\mathrm{N}_{2}<\mathrm{H}_{2}$
The order of increasing $\mathrm{m} . \mathrm{wt}$. is
$\mathrm{H}_{2}<\mathrm{N}_{2}<\mathrm{O}_{2}<\mathrm{HBr}$
Order of $V_{\mathrm{mx}}$ of molecules. $\mathrm{HBr}<\mathrm{O}_{2}<\mathrm{N}_{2}<\mathrm{H}_{2}$
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