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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

`21 c c `

B

`42 c ,c`

C

`105 c c `

D

`63 c c `

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The correct Answer is:
A
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