Question

The substance which accelerates the speed of a reaction without itself undergoing any change is called a

• A. catalyst
• B. pollutant
• C. fuel
• D. none of the above

Answer 1

The correct option is A

catalyst

The explanation for the correct option:

(A) Catalyst:

• A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change is called a catalyst.
• Examples: 1) Nickel, Ni is used in the hydrogenation of palm oil into margarine. 2) Iron, Fe is used in the Haber process.

The explanation for the incorrect options:

(B) Pollutant:

• It is a substance that is present in concentrations that may harm living organisms or exceed an environmental quality standard.
• Example: Carbon Monoxide, Nitrogen Oxides, Sulphur Dioxide, etc, are examples of air pollutants.

(C) Fuel: any substance burned as a source of heat or power, such as coal or petrol, etc.

Hence option (A) is correct.