Biology NEET Full Syllabus Mock Test 180 Questions New Syllabus Mock Test - 11 PCB Single Correct MCQ
Published on: August 21, 2026

Assertion: Assuming the elementary reaction to occur through molecular collisions, molecularity of a reaction is defined as the number of atoms or molecules which collide together for reaction to occur.
Reason: The sum of powers of the concentration of the reactants in the rate law expression is called the order of the chemical reaction.

A
If both assertion and reason are correct and reason is the correct explanation of assertion.
B
If both assertion and reason are correct but reason is not the correct explanation of assertion.
C
If assertion is correct but reason is wrong.
D
If assertion is wrong but reason is correct.

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The correct answer is:
B

The order of reaction applies to both simple and complex reactions. A complicated reaction is composed of numerous elementary reactions. The number of molecules participating in each elementary reaction may differ, implying that the molecularity of each step may differ. As a result, discussing the molecularity of the total complex reaction is pointless.

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