At chemical equilibrium in a closed system:
AThe forward reaction stops
BConcentrations are all zero
CAll reactants become products
DForward and reverse rates are equal
Answer & Solution
Correct answer: D. Forward and reverse rates are equal
1. Dynamic equilibrium: forward and reverse reactions both continue, but at the SAME RATE.
2. Macroscopic concentrations therefore stay constant — but the reaction itself isn't 'stopped'.
3. (C) describes a complete (irreversible) reaction; (D) is impossible.
_Source: NCERT Class 11 Chem Ch 7 §7.1 Equilibrium_
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