Match the following List I with List II. List-I List-II a. NO 1. Insecticide b. PAN 2. Primary pollutant c. BHC 3. Herbicide d. NaClO3 4. Secondary pollutant A. a-2, b-4, c-1, d-3 B. a-4, b-2, c-1, d-3 C. a-2, b-4, c-3, d-1 D. a-2, b-3, c-4, d-1

The correct answer is: C. a-2, b-4, c-3, d-1.

• NO is a primary pollutant. Primary pollutants are pollutants that are emitted directly into the air from a source, such as a power plant or car exhaust.
• PAN is a secondary pollutant. Secondary pollutants are pollutants that are formed when primary pollutants react with other chemicals in the air.
• BHC is an insecticide. Insecticides are chemicals that are used to kill insects.
• NaClO3 is a herbicide. Herbicides are chemicals that are used to kill plants.

Here is a more detailed explanation of each option:

• Option A: a-4, b-2, c-1, d-3. This option is incorrect because NO is a primary pollutant, not a secondary pollutant.
• Option B: a-4, b-2, c-3, d-1. This option is incorrect because BHC is an insecticide, not a herbicide.
• Option C: a-2, b-4, c-3, d-1. This option is correct because NO is a primary pollutant, PAN is a secondary pollutant, BHC is an insecticide, and NaClO3 is a herbicide.
• Option D: a-2, b-3, c-4, d-1. This option is incorrect because NaClO3 is a herbicide, not a secondary pollutant.