Question

Chemical equilibrium for a reversible change means for :

• A. the forward reaction proceeds as fast as the backward reaction, i.e., velocity of opposing reaction is equal
• B. no change in concentration of reaction species with time
• C. dynamic equilibrium
• D. none of the above

Answer 1

Answer: (A), (B), (C)

The correct options are
A the forward reaction proceeds as fast as the backward reaction, i.e., velocity of opposing reaction is equal
B dynamic equilibrium
C no change in concentration of reaction species with time

Options (A), (B) and (C) are correct. These all are facts.
Chemical equilibrium is the state of a reversible chemical reaction when the rate of the reaction in the reverse direction equals that in the forward direction; there is no change in amounts or concentrations of reactants or products with time. As the reaction is occurring in both directions we called it dynamic equilibrium. It requires an input of energy to change the composition at equilibrium, i.e. to drive the reaction in the forward or reverse direction.