Decide which of the following statements about catalysts are true. If the statement is false, explain why.

(a) In an equilibrium process, a catalyst increases the rate of the forward reaction but leaves the rate of the reverse reaction unchanged.

(b) A catalyst is not consumed in the course of a reaction.

(c) The pathway for a reaction is the same in the presence of a catalyst as in its absence, but the rate constants are decreased in both the forward and the reverse directions.

(d) A catalyst must be carefully chosen to shift the equilibrium toward the products.