Chemical equilibrium is a dynamic equilibrium because

Options

A. the rate of forward reaction in nonzero
B. the rate of backward in nonzero
C. concentrations of reactants and products always keep changing
D. Both forward and backward reactions occur simultaneously at the rate which is nonzero.

Answer

D

Explanation

At equilibrium, individual molecules are continually reacting, even though the overall composition of the reaction mixture does not change because the rates of forward and backward reactions are equal.