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Question

For the reaction A + B  C + D the equilibrium constant is


  1. K = [A][B][C][D]

  2. K = [C][D][A][B]

  3. both a & b

  4. None of these


Solution

The correct option is B

K = [C][D][A][B]


aA + bB  cC + dD

The rate of forward reaction = k1 [A]a    [B]b

The rate of backward reaction =  k2  [C]c  [D]d

At Equilibrium, the rate of the backward reaction = the rate of the forward reaction

k2  [C]c [D]dk1 [A]a [B]b

K = k1k2 = [C]c[D]d[A]a[B]b

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