Fill in the blanks:
$(a)$ The rate of reaction ....... as the concentration of reactant decreases.
$(b)$ The rate of reaction ....... as the concentration of product increases.

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(A) The rate of reaction decreases as the concentration of reactant decreases because the frequency of effective collisions between reactant molecules reduces.
$(b)$ The rate of reaction generally decreases as the concentration of product increases,especially in reversible reactions,because the rate of the backward reaction increases,effectively reducing the net rate of the forward reaction.

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