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# 10 $dm^3$ of $N_2$ gas and $10\;dm^3$ of gas at X at the same temperature contain the same number of molecules. The gas $X$ is

$\begin{array}{1 1}(a)\;CO&(b)\;CO_2 \\(c)\;H_2&(d)\;NO\end{array}$

No of moles of $N_2$ and $X$ should be equal.This can be so if X has same molecular weight as $N_2$
Hence (a) CO is the correct answer.