Question

Match the columns.

	Column-I		Column-II
a	Nitrous oxide	$1$	Secondary pollutant from car exhausts
b	Chlorofluorocarbons	$2$	Combustion of fossil fuels
c	Methane	$3$	Denitrification
d	Ozone	$4$	Refrigerators aerosols, sprays
e	Carbon dioxide	$5$	Cattle; rice fields, toilets

• A. a-$3$, b-$4$, c-$5$, d-$1$, e-$2$
• B. a-$5$, b-$1$, c-$3$, d-$4$, e-$2$
• C. a-$4$, b-$5$, c-$1$, d-$2$, e-$3$
• D. a-$1$, b-$3$, c-$4$, d-$5$, e-$2$
• E. a-$2$, b-$4$, c-$5$, d-$1$, e-$3$

Answer 1

The correct option is A a-$3$, b-$4$, c-$5$, d-$1$, e-$2$

	Column-I		Column-II
a	Nitrous oxide	3	Denitrification
b	Chlorofluorocarbons	4	Refrigerators aerosols, sprays
c	Methane	5	Cattle, Rice fields, toilets
d	Ozone	1	Secondary Pollutant from car exhausts
e	Carbon dioxide	2	Combustion of fossil fuels

a. Nitrous oxide is formed as a result of denitrification in which the nitrates are converted to oxides of nitrogen and released into the atmosphere.

b. Chlorofluorocarbons are the ozone-depleting gases that are contributed by the refrigerators, aerosols and sprays.

c. Methane is a greenhouse gas. The digestion activity in the rumen of cattle by the methanogenic bacteria, rice fields and the decomposition of faecal matter in the toilets release the methane into the environment.

d. Ozone in the troposphere is the secondary pollutant formed by the photooxidation of the car exhausts pollutants.

e. Carbon dioxide is also a greenhouse gas whose concentration has increased due to excessive combustion of fossil fuels.

Hence, the correct answer is 'a-3, b-4, c-5, d-1, e-2'.