(a) 1. As the concentration of the products increases, more products collide and react in the backward direction.
2. As the rate of the reverse reaction increases, the rate of the forward reaction decreases.
3. Eventually the rate of both reactions becomes equal.
(b) 1. Concentration of reactants decreases with time initially and concentration of products increases with time.
2. After sometime, equilibrium is reached i.e., concentration of reactants and products remains constant.
