Question

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

• A. when concentrations of reactants do not change with time
• B. when concentrations of all reactants and products are equal
• C. at time $t=0$
• D. when the reaction is a zero order reaction

Answer 1

The correct option is D when the reaction is a zero order reaction

The rate constant of a reaction is equal to the rate of reaction when the reaction is a zero order reaction.
For $n^{th}$ order reaction,
Rate $=k[A{]}^n$, where $k$ is the rate constant and $n$ is the order of the reaction. For zero order reaction, rate $=k[A{]}^0=k$