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Percentage Composition

At STP, the...

Question

At $S T P$ , the order of $R M S$ velocities of $H_{2}, N_{2}, O_{2}$ and $H B r$ molecules is:

A

H_{2} > N_{2} > O_{2} > H B r

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B

H B r > O_{2} > N_{2} > H_{2}

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C

H B r > H_{2} > N_{2} > O_{2}

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D

N_{2} > O_{2} > H_{2} > H B r

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Solution

The correct option is A $H_{2} > N_{2} > O_{2} > H B r$
Since, $V_{r m s} \propto \frac{1}{\sqrt{M}}$

Hence, decreasing order of RMS velocities will be from lower molecular weight to higher molecular weight.

$H_{2} > N_{2} > O_{2} > H B r$ .
Option A is correct.

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