For N 2 O 3   NO + NO 2 , if total pressure is P atm and amount of dissociation is 50%, the value of Kp will be
(1) 3 P                   (2) 2 P                  (3) P 3                   (4) P 2

For the reaction given the total pressure is P atm and the amount of dissociation is 50%                 N2O3NO+ NO2initial         1              0                0At time t     1-x       x                 xx=50% at pressure PKp=nNO.nNO2n N2O3.P=x.x1-x.P=(0.50)21-0.50.P=0.5P=P/2Hence option 4  is correct
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