When a chemical reaction and its reverse are occurring at the same time and at the same rate, the reaction has achieved

a. displacement.

c. imbalance.

b. equilibrium.

d. decomposition.

The correct answer is B. Equilibrium is achieved. When the forward and reverse paths of a change occur at the same rate, the system is in equilibrium specifically in dynamic equilibrium. Dynamic equilibrium is the balance in a process that is continuing. It is achieved in a reaction when the forward rate of reaction and the backward rate of reaction is at the same value or equal.