Ratio of the average speed of $H e$ and $S O_{2}$ at $27^{o} C$ will be:

4 : 1

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2 : 1

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8 : 1

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5 : 1

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Solution

The correct option is A $4 : 1$
$V_{a v g} = \sqrt{\frac{8 R T}{π M}} \propto \frac{1}{\sqrt{M}}$

$\frac{V_{a v g_{H e}}}{V_{a v g_{S O_{2}}}} = \sqrt{\frac{64}{4}} = \frac{4}{1}$

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