The rate constant of a reaction is equal to rate of reaction:

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At time t=0.

When concentrations of all reactants are unity.

When concentrations of reactants do not change with time.

When concentrations of all reactants and products are equal.

answer is D.

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Detailed Solution

$\begin{array}{l} a A + b B \to P \\ R a t e = \frac{1}{a} \frac{Δ [A]}{Δ t} = - \frac{1}{b} \frac{Δ [B]}{Δ t} = K {[A]}^{m} {[B]}^{n} \\ i f [A] = 1 M a n d [B] = 1 M \\ R a t e = K \end{array}$

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