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A flask contains hydrogen and oxygen in the ratio of $2: 1$ by mass at temperature $27^{\circ} \mathrm{C}$. The ratio of average kinetic energy per molecule of hydrogen and oxygen respectively is :
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The correct answer is:
1 : 1
1 : 1
Average kinetic energy for diatomic gases
$\begin{aligned}
& \mathrm{K}_{\mathrm{av}}=\frac{5}{2} \mathrm{kT} \\
& \therefore \frac{\left(\mathrm{K}_{\mathrm{av}}\right)_{\mathrm{H}}}{\left(\mathrm{K}_{\mathrm{av}}\right)_{\mathrm{O}}}=\frac{(27+273)}{(27+273)}=1
\end{aligned}$
$\begin{aligned}
& \mathrm{K}_{\mathrm{av}}=\frac{5}{2} \mathrm{kT} \\
& \therefore \frac{\left(\mathrm{K}_{\mathrm{av}}\right)_{\mathrm{H}}}{\left(\mathrm{K}_{\mathrm{av}}\right)_{\mathrm{O}}}=\frac{(27+273)}{(27+273)}=1
\end{aligned}$
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