Answer: The correct answer is d. The rates of the forward and reverse reactions are equal.
Step-by-step explanation:
During a reversible reaction, a reaction that can occur to both sides of the equation, the chemical equilibirum is a state when the rates of reaction forward and reverse are equal, this means that the reaction never stops, it keep happening, but the conversion and decomposition rates are the same, and not necessarily the concentrations of reactants and products are equal.
Therefore, the correct answer is d. The rates of the forward and reverse reactions are equal.