Question

A catalyst is used
(a) Only for increasing the velocity of the
reaction
(b) For altering the velocity of the reaction
(c) Only for decreasing the velocity of the
reaction
(d) All (a), (b) and (c) are correct.

Answer 1

Answer:

d) All (a) , (b) and (c) are correct

Answer 2

(a) Only for increasing the velocity of the reaction

Explanation:

A catalyst speeds up a chemical reaction, without being consumed by the reaction. Catalysts decrease the activation energy required for a reaction to proceed and therefore increase the reaction rate. So a catalyst is used only for increasing the velocity of the reaction.

Hence Option A is the answer.