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Law of Mass Action

which of the ...

Question

which of the following relation is correct for $k_{f}$ and $k_{b}$ in an equilibrium process that contains equal moles of reactants and products.

A

k_{f} > k_{b}

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B

k_{f} = k_{b}

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C

k_{f} < k_{b}

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D

we cannot predict

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Solution

The correct option is B $k_{f} = k_{b}$
Here give equal moles of reactant & product $A_{f} B$
we know at equilibrium
rate of forward reaction $=$ rate of backward reaction
$K_{f} [A] = K_{b} [B]$ ( $∵$ given equal)
$K_{f} = K_{b}$ is the correct answer.

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