Question

A substance which decreases the rate of a reaction is known as a negative catalyst.

• A. True
• B. False

Answer 1

The correct option is A

True

A catalyst is a substance which alters the rate of the reaction without themselves undergoing a chemical change. There are two types of catalysts.

(i) Positive catalyst- A substance which increases the rate of a reaction. Example: Manganese dioxide

(ii) Negative catalyst- A substance which decreases the rate of a reaction. Example: Phosphoric acid