Question

Which of the following is true for a reaction to be zero-order?

• A. The rate of reaction is independent of the concentration of reactants.
• B. The rate constant has units of mol/L
• C. The rate increases with the concentration of reactants
• D. The reaction is independent of temperature

Hint:

In zero-order kinetics, the rate is constant and does not change with concentration—visualize it as a flat line on a rate vs. concentration graph.

Answer 1

The Correct Option is A

In a zero-order reaction, the rate of reaction does not depend on the concentration of the reactants.
This means that even if the concentration of a reactant increases or decreases, the rate remains constant.
The rate law for a zero-order reaction is: \[ \text{Rate} = k \] where \( k \) is the rate constant.
This type of behavior is often observed in reactions occurring on surfaces or those catalyzed by enzymes when the active sites are fully saturated.
Hence, the defining feature of a zero-order reaction is that its rate is independent of the concentration of the reactants.