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A bulb of unknown volume 'V' Contains an...

A bulb of unknown volume 'V' Contains an ideal gas at 2 atm pressure. It was connected to another evacuated bulb of volume 0.5 litre through a stopcock. When the stopcock was opened the pressure in each bulb became 0.5 atm. Then V is 

A

`0.1 L`

B

`0.3 L`

C

`1.7 L`

D

`3.0 L`

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The correct Answer is:
A
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