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Question

The value of Kc for the reaction: 2AB+C is 2×103. At a given time the composition of reaction mixture is [A]=[B]=[C]=3×104M. In which direction the reaction will proceed?

A
Forward
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B
Backward
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C
At equilibrium
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D
Forward or Backward
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Solution

The correct option is D Backward
For the reaction the reaction quotient Qc is given by,
Qc=[B][C][A]2

as [A]=[B]=[C]=3×104M

Qc=(3×104)(3×104)(3×104)2=1

As, Qc>Kc so the reaction will proceed in the reverse direction

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