A substance that increases the rate of a reaction without itself being consumed is called-

Correct option is A

The correct answer is (a) Catalyst.
· A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed or permanently altered in the process. It works by providing an alternative reaction pathway with a lower activation energy, allowing the reaction to proceed faster.
Information Booster:
· Reactant: A substance that undergoes change during a chemical reaction.
· Product: The substances that are formed as a result of a chemical reaction.
· Inhibitor: A substance that decreases the rate of a chemical reaction or prevents it from occurring.