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Q 1113891749.     `CH_4` diffuses two times faster than a gas `X`.The number of molecules present in `32` g of gas `X` is: (`N` is Avogadro number)

A

`N`

B

`N/2`

C

`N/4`

D

`N/16`

HINT

Use formula: `R prop1/sqrtM`

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