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X ml of H2 gas effuses through a hole in...

X ml of `H_2` gas effuses through a hole in a container in 5 sec. The time taken for the effusion of same volume of gas specified below under identical conditions is

A

10 sec, He

B

20 sec, `O_2`

C

`25 sec , CO`

D

`55 sec , CO_2`

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The correct Answer is:
B
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