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2gm of 'He' exerts a pressure of 2 atmos...

2gm of 'He' exerts a pressure of 2 atmospheres in a rigid flask. How many grams of `H_(2)` should be pumped into the flask such that the pressure raises to 4 atm

A

2 gm

B

0.5

C

1 gm

D

4 gm

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