Chemistry Equilibrium DUHS 2023
PMDC Verified Question 43 of 102
Which of the following is true for reversible reaction at equilibrium?
A
The rate of forward reaction is greater than backward reaction
B
The rate of forward reaction is lesser than backward reaction
C
The rate of backward reaction is equal to forward reaction
D
The rate of backward reaction is greater than forward 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: The rate of backward reaction is equal to forward reaction
Concept:

Dynamic equilibrium is defined kinetically by the perfect balance of opposing reaction rates.

Formula:

$$ Rate_f = Rate_r $$

Solution:

  • In a closed system, as reactants are consumed, the forward rate slows down.


  • Simultaneously, as products accumulate, the backward rate speeds up.


  • Equilibrium is the exact moment these two rates intersect.


  • At this point, the rate of the backward reaction is perfectly equal to the rate of the forward reaction, meaning there is no longer any net change in macroscopic concentrations.


Why other options are incorrect:

If one rate is greater than the other (Options A, B, D), the system is actively shifting and, by definition, has not yet reached equilibrium.

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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