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At STP, the order of mean square velocit...

At `STP`, the order of mean square velocity of molecules of `H_(2)`, `N_(2)`, `O_(2)`, and `HBr` is

A

`H_(2)ltN_(2)ltO_(2)ltHBr`

B

`HBrltO_(2)ltN_(2)ltH_(2)`

C

`H_(2)ltN_(2)=O_(2)ltHBr`

D

`HBrltO_(2)ltH_(2)ltN_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
The root mean square velocity of gas molecule at STP given by
`U_(rms)=sqrt((3RT)/(M))`
`therefore` As the molar mass of gas increases, then `U_(rms)` will decrease, so the order of `U_(rms)` of these gases is
`HBr ltO_(2) lt N_(2) lt H_(2)`
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