Q 1284123957.     A spherical balloon of `21` cm diameter is to be filled up with hydrogen at NTP from a cylinder containing the gas at `20` atmosphere at `27^o`C. If the cylinder can hold `2.82` litre of water at NTP, calculate the number of balloon that can be filled up.

A

`12`

B

`10`

C

`7`

D

None of these

HINT

Use formula: `pV = nRT`
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