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At the equilibrium state of a reversible reaction in a closed vessel, which condition is satisfied?
AThe higher temperature reached during the reaction
BThe greater concentration of the acid in the mixture
CThe greater surface area of the powdered reactant
DThe addition of a suitable catalyst to the mixture
Answer & Solution
Correct answer: C. The greater surface area of the powdered reactant
1. At equilibrium both forward and backward reactions still occur; it is a dynamic state, so the forward reaction has not stopped.
2. Equilibrium is reached when the rate of the forward reaction becomes equal to the rate of the backward reaction.
3. Because neither rate exceeds the other, no net change in amounts occurs, so reactants are not fully converted.
4. Therefore at equilibrium the forward and backward rates are equal.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "State of Equilibrium", p.153_
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