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Question

In a system A(s)2B(g)+3C(g). If the concentration of C at equilibrium is increased by a factor 2, it will cause the equilibrium concentration of B to change to:

A
two times of its original value
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B
one half of its original value
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C
32 times of its original value
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D
122 times of its original value
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Solution

The correct option is D 122 times of its original value
A(s)2B(g)+3C(g)
KP=(PB)2×(PC)3
KP(PC)3=(PB)2(1)
If we increase concentration of C by a factor of 2, KP(2PC)3=(P1B)2(2)
From (1) & (2)
KP23(PC)3=(P1B)2
KP23(PC)3=(PB1)2
123(PB)2=(P1B)2
(PB1)=PB22
Pressure of B will reduce by 22 i.e; 122 times of its original value.

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