Q.

The dissociation equilibrium of a gas AB2 can be represented as

2AB2(g)     2AB(g)  +  B2(g)

The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure P is 

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a

2KP/P1/2

b

2KP/P1/3

c

KP/P

d

2KP/P

answer is A.

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Detailed Solution

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2AB2(g)     2AB(g)  +  B2(g)

   1                     0                  0

1 - x                   x                  x/2

          KP = x2.x21-x2 . P1+x2 = x3. P2

1-x   1  and 1 + x2  1,  since x < < 1

Or         P = 2KPP3

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The dissociation equilibrium of a gas AB2 can be represented as2AB2(g)   ⇌  2AB(g)  +  B2(g)The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure P is