Q. 19

The value of rate constant of a pseudo first order reaction ____________.
A. depends on the concentration of reactants present in small amount.

B. depends on the concentration of reactants present in excess.

C. is independent of the concentration of reactants..6

D. depends only on temperature.

Answer :

Conditions play an important role in determining the order of a reaction.

For Example, Hydrolysis of .01 mole of ethyl acetate in the presence of 10 moles of water, the reaction at first glance appears to be the first-order reaction but since the concentration of water does not change much in comparison to ethyl acetate the order of reaction becomes pseudo-first-order reaction.


For a pseudo-first-order reaction, the reactant with a large amount of concentration is ignored.


As the change in its concentration is negligible with comparison to another component in respect with time.


Hence, the rate only gets dependent upon reactant in small quantity.


Thus making option (i) correct and other options are incorrect.

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