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Matter Waves

At STP, the...

Question

At $S T P$ , the order of root mean square speed os molecules $H_{2}, N_{2}, O_{2}$ and $H B r$ 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} > O_{2} > N_{2}

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D

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

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Solution

The correct option is D $H_{2} > N_{2} > O_{2} > H B r$
At $S T P$ , the order of root mean square speed of molecules $H_{2}, N_{2}, O_{2}$ and $H B r$ is $H_{2} > N_{2} > O_{2} > H B r$ . RMS speed is inversely proportional to the square root of molar mass. The order of molar masses is $H B r (80.9 g / m o l) > O_{2} (32 g / m o l) > N_{2} (28 g / m o l) > H_{2} (2 g / m o l)$ .

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