A certain reaction A ⇌ B reaches equilibrium. Which of the following statements about the equilibrium is or are true?
I. At equilibrium, the concentrations of A and B in the reaction mixture must be equal.
II. At equilibrium, the processes A ➔ B and B ➔ A have the same reaction rates.
III. At equilibrium, molecules of A are no longer converted into molecules of B.
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