Correct answer option C - the amount of reactants and product do not change is always true for a chemical reaction that has reached equilibrium.
Chemical reaction at equilibrium occurs when reactants and products are present in a concentration and have no further tendency to change with time.
The rate of forward reaction is not greater than the rate of reverse reaction rather rate of reaction of forward reaction is same as the rate of reverse reaction for a chemical reaction at equilibrium. Both forward and reverse reaction do not always stop and option A - the yield of product is greater than 50% is not always true.
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