Practice — Chemical Kinetics

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CBSE 12 Chemistry
U3
Item 5

Multiple choice·Routine exam skill (2/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

Assertion (A): The instantaneous rate of disappearance of a reactant is obtained from the slope of the tangent to its concentration-time curve. Reason (R): A tangent gives the limiting value of

\Delta[A]/\Delta t

at that instant.

Choose an answer

A.A is true, but R is false.

B.A is false, but R is true.

C.Both A and R are true, and R correctly explains A.

D.Both A and R are true, but R does not explain A.

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