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Q.

If for 2A2B(g)  ⇌   2A2(g)   +  B2(g),KP = Total Pressure (at equilibrium) and starting the dissociation from 4 mol of A2B then

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a

degree of dissociation of A2B will be (2/3)

b

total no. of moles at equilibrium will be (14/3)

c

at equilibrium the no. of moles of A2B is not equal to the no. of moles of B2

d

at equilibrium the no. of moles of A2B is equal to the no. of moles of A2

answer is A.

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Detailed Solution

2A2B  ⇌   2A2   +  B2           …… (1)t = 0                        1               0            0t=tM                   1 -2α       2α          αTotal mole = 1 + αPA2B =1-2αP1+α ; PA2= 2α1 + α.P  ; PB2=  α1 + α.PKP=2α . P1+α2 . αP1+α1-2α1+α2. P2                             ………..(2)4α21+α2. α1+α = 1-2α21+α24α3=  1+α  4α2-4α + 1 …….(3)4α3 = 4α2 + 4α3 -4α -4α2+1+α1 = 3α,   α = 13for A2B , degree of dissociation=2α = 23
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