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(C) The addition of a catalyst has no effect on the value of the equilibrium constant $(K_{eq})$.$A$ catalyst increases the rate of both the forward a

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The ratio of the mixture at equilibrium is not changed by a catalyst.

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(C) The addition of a catalyst has no effect on the value of the equilibrium constant $(K_{eq})$.$A$ catalyst increases the rate of both the forward and backward reactions by the same proportion by lowering the activation energy.Since both rates are increased equally,the position of equilibrium and the ratio of the mixture at equilibrium remain unchanged.Catalysts can exist in solid,liquid,or gaseous states,not just in solution.

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