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Q)

At $0^{\circ}$, the density of carbon-di-oxide is the same as that of an oxide of nitrogen. The oxide of nitrogen is which of the following, considering the pressure conditions to be the same?

(A) $NO_2$ (B) $N_2O$ (C) $NO$ (D) $N_2O_2$

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A)
For any ideal gas, denity $\rho = \large\frac{PM}{RT}$
For density to be equal at equal temperatures, mass of the gases needs to be the same.
Molecular mass of $CO_2 = 44 =$ molar mass of $N_2O \rightarrow$ this must be the oxide with the same density as $CO_2$.