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Molar mass of certain gas A is half that...

Molar mass of certain gas A is half that of B. If rms speed of molecules of A at certain temperature is `200 ms^(-1)` . The rms speed of B at the temperature half that of A will be

A

`200 ms^(-1)`

B

`100 ms^(-1)`

C

`300 ms^(-1)`

D

`400 ms^(-1)`

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