Q.

The values of Kp1  and Kp2 for the reactionsX  ⇌   Y + Z          (i)and A  ⇌   2B         (ii)are in the ratio of 9 : 1. If the degree of dissociation of X and A be equal, then total pressure at equilibrium (i) and (ii) are in the ratio

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a

3 : 1

b

1 : 9

c

36 : 1

d

1 : 1

answer is C.

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Detailed Solution

In equation,        X  ⇌   Y + ZInitial moles         1           0       0At equilibrium    1-α     α      αWhere α = degree of dissociationTotal number of moles = 1 - α + α + α = (1 + α)px = 1-α1+αp1 py = α1+αp1 pz = α1+αp1 Kp1 = py  pzpx= α1+αp1  ×     α1+αp1 1-α1+αp1       =  α1+α2p11-α1+α=α2(1+α)(1-α)P1 ……… (i)For equation,     A  ⇌   2BInitial moles       1            0At equilibrium 1-α      2αTotal number of moles at equilibrium   (1 + α)pB = 2α1+αp2 pB = 1-α1+αp2 Kp2 =  pB2pA  =   2α1+αp221-α1+αp2 = 2α1+α2p21-α1+α=4α2(1+α)(1-α)P2Eq. (i) / (ii)Kp1Kp2 = α2  × p1 4α2  × p2 91  =  p14p2 p1p2 = 361  = 36 : 1
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