Chemistry Reaction Kinetics NUMS 2022
PMDC Verified Question 41 of 80
What is "NOT TRUE" about rate of a reaction?
A
Surface area of reactants affects rate of reaction
B
Catalyst affects rate of a reaction
C
Concentration of reactants does not affect the rate of a reaction
D
Concentration affects rate of reaction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Concentration of reactants does not affect the rate of a reaction
Concept:

The Law of Mass Action and general chemical kinetics state that the rate of a reaction is directly influenced by the concentration of its reactants (except in zero-order reactions).

Solution:

  • The statement "Concentration of reactants does not affect the rate of a reaction" is a broadly false generalization.
  • For the vast majority of chemical processes (first, second, third order, etc.), increasing the concentration of reactants increases the frequency of collisions, thereby increasing the rate.
  • Therefore, this statement is the "NOT TRUE" option.


Why other options are incorrect:

Surface area, catalysts, and concentration all genuinely affect the rate of chemical reactions, making those statements true.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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