The rates of diffusion of ${S O}_{3}, {C O}_{2}, {P C l}_{3}$ and ${S O}_{2}$ are in the order:

{P C l}_{3} > {S O}_{3} > {S O}_{2} > {C O}_{2}

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{C O}_{2} > {S O}_{2} > {P C l}_{3} > {S O}_{3}

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{S O}_{2} > {S O}_{3} > {P C l}_{3} > {C O}_{2}

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{C O}_{2} > {S O}_{2} > {S O}_{3} > {P C l}_{3}

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Solution

The correct option is D ${C O}_{2} > {S O}_{2} > {S O}_{3} > {P C l}_{3}$
Solution:- (D) $C O_{2} > S O_{2} > S O_{3} > P {C l}_{3}$
Using Graham's law-
$r \propto \frac{1}{M}$
Molecular weight of $S O_{3} = 80 g / m o l$
Molecular weight of $C O_{2} = 44 g / m o l$
Molecular weight of $P {C l}_{3} = 137.33 g / m o l$
Molecular weight of $S O_{2} = 64 g / m o l$
Hence the correct order for rate of diffusion is-
$C O_{2} > S O_{2} > S O_{3} > P {C l}_{3}$

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