Chemistry Equilibrium DUHS 2022
PMDC Verified Question 60 of 102
At equilibrium in a reversible reaction:
A
The rate of backward reaction > rate of forward reaction
B
The rate of forward reaction > rate of backward reaction
C
The concentration of reactant & products becomes constant
D
The concentration of reactants & products becomes constant & the rate of forward reaction is same as the rate of backward reaction.
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: The concentration of reactants & products becomes constant & the rate of forward reaction is same as the rate of backward reaction.
Concept:

Dynamic equilibrium is defined by two simultaneous macroscopic conditions occurring in a reversible system.

Solution:

  • Kinetic condition: The speed at which reactants form products exactly equals the speed at which products revert into reactants (Rate forward = Rate backward).


  • Thermodynamic condition: Because the rates are locked in balance, the net amount of reactants and products stops changing over time, meaning their macroscopic concentrations remain perfectly constant.


  • Option D perfectly encapsulates both halves of this definition.


Why other options are incorrect:

Rates being unequal implies the system is still shifting and has not reached equilibrium. Option C is true but incomplete compared to D.

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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