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Two ideal gases A and B have molar masse...

Two ideal gases A and B have molar masses `M_(A) and M_(B)g*mol^(-1)` respectively. Volumes of the same mass of A and B are the same, and the rms velocity of A molecules is twice that of the molecules of B. if `M_(A):M_(B)=2:1`, then the ratio of the pressures of A to B is-

A

`4:1`

B

`8:1`

C

`2:1`

D

`1:6`

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A
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