Question

Which of the following graphs most appropriately represents a zero-order reaction?

• A.
• B.
• C.
• D.

Hint:

For zero-order reactions, the concentration decreases linearly with time, and the rate is constant over the course of the reaction.

Answer 1

The Correct Option is B

For a zero-order reaction, the rate law is: $$\text{Rate} = k,$$ which means the rate is independent of the reactant concentration. The integrated rate law for a zero-order reaction is: $$[\text{A}] = [\text{A}]_0 - kt.$$ This shows that the concentration of the reactant decreases linearly with time. Therefore, the graph of concentration versus time for a zero-order reaction is a straight line with a negative slope.