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A balloon is filled at 27^(@)C and 1 atm...

A balloon is filled at `27^(@)C` and 1 atm pressure by `500 m^(3)` He. At-`3^(@)C` and 0.5 atm pressures, the volume of He-gas contained in balloon will be

A

`700 m ^(3)`

B

` 900 m ^(3)`

C

` 1000 m ^(3)`

D

` 500 m ^(3)`

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