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A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C.

Its density is: (R = 8.3 J mol-1   K-1)

(1) 0.5 kg/m3

(2) 0.2 kg/m3

(3) 0.1 kg/m3

(4) 0.02 kg/m3

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Ans: (2) 0.2 kg/m3

Explanation: 

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