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Which of the following are not correct a...

Which of the following are not correct at `298K`?

A

The average K.E of molecules of P is equal to that of Q

B

The mass of 1 `dm^3` of P is four times that of 1` dm^(3)` of Q

C

On mixing 1`dm^(3)` of P with 1`dm^(3)` of Q the partial pressure of each gas in the mixture will be 0.5 atm

D

The rate of diffusion of P is 4 times less than that of Q

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