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A mass of diatomic gas (γ=1.4) at a pressure of 2 atm is compressed adiabatically so that its temperature rise from 27°C to 927°C. The pressure of the gas is final state is 

(a) 28 atm                                            (b) 68.7 atm

(c) 256 atm                                           (d) 8 atm

NEET