Answer:
a. It is microscopically dynamic and macroscopically static.
Explanation:
Chemical equilibrium is achieved when the rate of the backward reaction and the rate of the backward reaction are equal. At a microscopic level, the backward reaction and forward reactions continue to happen. So products and reactants are both being used up and being created. At macroscopic level however, there is no change, the number of moles, and hence concentration, of products and reactants are not changing.
