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The rms velocity of hydrogen gas molecules at `NTP` is `V rms^(-1)`. The gas is heated at constant volume till the pressure becomes four times. The final rms velocity is
A. `V//2`
B. `V`
C. `2 V`
D. `4 V`

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Correct Answer - C
`P propT`, `P` is increased by a factor of `4`. Same with `T` increased by a factor of 2. so, `C` is increased by a factor of `2`.

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