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Which equilibrium shift occurs when excess reactant is added to a closed batch reactor?

A)Forward reaction rate increases
B)Reverse reaction rate increases
C)Equilibrium constant decreases
D)Equilibrium constant increases

💡 Explanation

Increasing reactant concentration causes an initial increase in the rate of the forward reaction due to Le Chatelier's principle; this re-establishes equilibrium. Thus, the forward reaction rate increases because the system shifts to consume the excess reactant rather than the reverse reaction dominating.

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