JUPEBChemistryChemical Equilibrium

Which of the following is NOT a characteristic of a system in dynamic equilibrium?

AThe rates of the forward and backward reactions are equal.
BIt can only be attained in a closed system.
CThe concentrations of reactants and products remain constant.
DThe forward and backward reactions have stopped.CORRECT
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Why the answer is D, and why the others tempt you.
Equilibrium is dynamic: both reactions continue at equal rates, which is why the concentrations appear constant. The reactions do not stop. A closed system is needed so that no substance escapes.
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