Question

A chemical substance which is not a pollutant but becomes a pollutant on reaction with other substance is called ___________.

• A. primary environmental pollutant
• B. secondary environmental pollutant
• C. tertiary environmental pollutant
• D. none of these

Answer 1

Answer: (B)

secondary environmental pollutant

Introduction of substances that are harmful to the environment is called environmental pollution and the substance is called pollutant. A chemical substance which is not a pollutant but becomes a pollutant on reaction with other substance is called secondary pollutant. Example, secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight, acid rain, which is formed when sulphur dioxide or nitrogen oxides react with water etc.