Match the columns: Column-I Column-II A. Nitrous oxide (i) Secondary pollutant from car exhausts B. Chlorofluorocarbons (ii) Combustion of fossil fuels C. Methane (iii) Denitrification D. Ozone (iv) Refrigerators aerosols sprays E. Carbon dioxide (v) Cattle, rice fields, toilets

Question

Match the columns: Column-I Column-II A. Nitrous oxide (i) Secondary pollutant from car exhausts B. Chlorofluorocarbons (ii) Combustion of fossil fuels C. Methane (iii) Denitrification D. Ozone (iv) Refrigerators aerosols sprays E. Carbon dioxide (v) Cattle, rice fields, toilets, A = (ii), B = (iv), C = (v), D = (i), E = (ii), A = (v), B = (i), C = (iii), D = (iv), E = (ii), A = (iv), B = (v), C = (i), D = (ii), E = (iii), A = (ii), B = (iii), C = (iv), D = (v), E = (ii)

MARKS App · Accepted Answer

The nitrogen oxides are released into the atmosphere when fossil fuels are burnt and that contributes to the formation of smog and acid rain. Chlorofluorocarbons (CFCs) are the compounds released into the atmosphere due to the usage of air-conditioning, refrigeration, blowing agents in foams, insulations and packing materials, propellants in aerosol cans and as solvents. The digestion activity of the methanogenic bacteria, the decomposition of fecal matter in the toilets and rice fields release methane into the environment. Ozone in the troposphere is the secondary pollutant formed by the photooxidation of the car exhausts pollutants. Oxygen combines with carbon to form CO 2 and with hydrogen to form water (H 2 O) when fossil fuels are burned.

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	Column-I		Column-II
A.	Nitrous oxide	(i)	Secondary pollutant from car exhausts
B.	Chlorofluorocarbons	(ii)	Combustion of fossil fuels
C.	Methane	(iii)	Denitrification
D.	Ozone	(iv)	Refrigerators aerosols sprays
E.	Carbon dioxide	(v)	Cattle, rice fields, toilets