Which of the pairs of gases diffuses at a slower rate than $C O_{2}$ ?

H_{2}

and

H e

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S O_{2}

and

S O_{3}

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N_{2}

and

C O

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N_{2} O

and

C_{3} H_{8}

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Solution

The correct option is B $S O_{2}$ and $S O_{3}$
$∵$ Rate of diffusion $\propto \frac{1}{\sqrt{M o l e c u l a r w e i g h t}}$
$∴$ The gases that have molecular weight greater than that of $C O_{2} (M W = 44)$ will diffuse at slower rate. So, $S O_{2}$ and $S O_{3}$ will diffuse slower than $C O_{2}$ .

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