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Question

For which reactions at 298 K, the value of KpKc is maximum and minimum respectively.
(a) N2O4(g)2NO2(g)
(b) 2SO2(g)+O2(g)2SO3(g)
(c) X(g)+Y(g)4Z(g)
(d) A(g)+3B(g)7C(g)

A
d, c
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B
d, b
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C
c, b
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D
d, a
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Solution

The correct option is B d, b
We know the relation Kp=Kc×(RT)n
where n=npng
(a) N2O4(g)2NO2(g)
n=21=1
Kp=Kc×(RT)KpKc=RT

(b) 2SO2(g)+O2(g)2SO3(g)
n=2(2+1)=1
Kp=Kc(RT)1
KpKc=1RT== Minimum value

(c) X(g)+Y(g)4Z(g)
n=4(1+1)=2
Kp=Kc(RT)2
KpKc=(RT)2
(d) A(g)+3B(g)7C(g)
n=7(1+3)
=3
Kp=Kc(RT)3
KpKc=(RT)3=Maximum value

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