Chemistry Reaction Kinetics SZABMU 2023
PMDC Verified Question 17 of 80
The rate of reaction:
A
Remains the same as the reaction proceeds
B
Increases as the reaction proceeds
C
Decreases as the reaction proceeds
D
Remains the same initially and then increases
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Decreases as the reaction proceeds
Concept:

According to the Law of Mass Action, the speed of a chemical reaction is proportional to the concentration of the reacting substances.

Solution:

  • As a chemical reaction progresses over time, the reactant molecules collide and are converted into products.
  • Consequently, the concentration of the reactants continuously decreases.
  • Because there are fewer reactant molecules available to collide, the frequency of effective collisions drops, causing the rate of reaction to decrease continuously as it proceeds toward completion or equilibrium.


Why other options are incorrect:

The rate only remains the same in a strict zero-order reaction (rare). It does not increase because reactants are being depleted, not generated.

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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