Answered

Adding a catalyst to a chemical reaction results in

(1) a decrease in activation energy and a decrease in the reaction rate

(2) a decrease in activation energy and an increase in the reaction rate

(3) an increase in activation energy and a decrease in the reaction rate

(4) an increase in activation energy

Verified Answer :

Adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate.

Answer: Option (2) is the correct answer.

Explanation:

Activation energy is the minimum amount of energy required to start or initiate a chemical reaction.

Whereas a catalyst helps in increasing the energy of reactant molecules so that they can overcome activation energy barrier and actively participate in the reaction.

Hence, adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate.

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