Question

The value of rate constant for a pseudo first order reaction:

• A. depends only on temperature.
• B. depends on the concentration of reactants present in small amount.
• C. depends on the concentration of reactants present in large excess.
• D. is not dependent on the concentration of reactants.

Hint:

Pseudo-first-order reactions can often be simplified to first-order reactions when one reactant is in large excess.

Answer 1

The Correct Option is C

In a pseudo-first-order reaction, the reaction behaves as though it is first-order because one reactant is in large excess and effectively constant. The rate constant depends on the concentration of the limiting reactant, which is present in large excess, simplifying the rate law to a pseudo-first-order form.