Question

Ahe substance which initiates a photochemical reaction but itself does not undergo any chemical change is called

Answer 1

Answer:

A photochemical reaction is a chemical reaction triggered when light energy is absorbed by a substance's molecules. This response leads the molecules to experience a temporary excited state, thus altering their physical and chemical properties from the substance's initial molecule.

Answer 2

The substance which initiates a reaction but itself does not undergo any chemical change is called Catalyst.

Explanation:

• Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst.
• The catalyst is not consumed in the reaction and remains unchanged thereafter.
• A catalyst is a substance that is an element or compound that increases the rate of a chemical reaction.
• Examples:

1) Nickel, Ni are used in the hydrogenation of palm oil in margarine.

2) Iron, Fe are used in Haber process. (formation of ammonia)

Correct Question: The substance which initiates a reaction but itself does not undergo any chemical change is called