Which statement must be true about the link between reactio…

Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 12 PCB Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Which statement must be true about the link between reaction order and mechanism?

A zero order reaction cannot be a single step reaction.

A first order reaction must be a single step reaction.

A second order reaction cannot be a single step reaction.

A zero order reaction can not be a complex reaction.

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The correct answer is:

Zero-order kinetics arise from complex/surface-saturated or photochemical mechanisms; an elementary single-step reaction cannot be zero order (rate of an elementary step depends on at least one concentration).

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