Which of the following pairs will diffuse at the same rate through a porous plug?

C O, {N O}_{2}

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{N O}_{2}, {C O}_{2}

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{N H}_{3}, {P H}_{3}

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N O, C_{2} H_{6}

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Solution

The correct option is D $N O, C_{2} H_{6}$
According to grahm's law of diffusion Molecular weight is inversely proportional to rate of diffusion.It means that those molecules which has same molecular weight can diffuse the at same rate.
In the bove given examples option D has the same molecular weight for both $N O, C_{2} H_{6}$ ,i.e $28$ .
Hence option $D$ is correct.

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