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(D) According to Graham's law of diffusion,the rate of diffusion $(r)$ is inversely proportional to the square root of the molar mass $(M)$,i.e.,$r \p

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$NO, C_2H_6$

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(D) According to Graham's law of diffusion,the rate of diffusion $(r)$ is inversely proportional to the square root of the molar mass $(M)$,i.e.,$r \propto \frac{1}{\sqrt{M}}$.Two gases will diffuse at the same rate if they have the same molar mass.For $NO$: Molar mass = $14 + 16 = 30 \ g/mol$.For $CO$: Molar mass = $12 + 16 = 28 \ g/mol$.For $CO_2$: Molar mass = $12 + 32 = 44 \ g/mol$.For $NH_3$: Molar mass = $14 + 3 = 17 \ g/mol$.For $PH_3$: Molar mass = $31 + 3 = 34 \ g/mol$.For $C_2H_6$: Molar mass = $(2 	imes 12) + (6 	imes 1) = 30 \ g/mol$.Wait,re-evaluating the options:Option $A$: $NO (30)$ and $CO (28)$.Option $B$: $NO (30)$ and $CO_2 (44)$.Option $C$: $NH_3 (17)$ and $PH_3 (34)$.Option $D$: $NO (30)$ and $C_2H_6 (30)$.Since $NO$ and $C_2H_6$ both have a molar mass of $30 \ g/mol$,they will diffuse at the same rate. Thus,option $D$ is correct.

In which of the following pairs do the gaseous species diffuse with the same rate of diffusion under similar conditions of temperature and pressure?

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