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Which outcome increases when hydrogen cyanide production reaches its equilibrium?

A)Product yield stays constant instead
B)HCN decomposition rate decreases then
C)Reactant replenishment remains effective
D)Reaction becomes overall exothermic now

💡 Explanation

At equilibrium, the forward and reverse reaction rates equate; therefore, the product yield stays constant because formation balances decomposition, rather than one direction dominating as in non-equilibrium conditions which would alter the overall yield further.

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