Answer :
The rate of forward and reverse reaction.
Equilibrium occurs when the rates of the forward and reverse reactions are equal.
At equilibrium, the concentrations of each reactant and product are both constant. The ratio of the reactant and product concentrations does not vary at the equilibrium temperature when a reaction is at an equilibrium state. This indicates that the concentrations of the reactants and products remain unchanged at equilibrium. According to another definition, a chemical reaction is at equilibrium when the rates of the forward and reverse reactions are equal.
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