In the formation of Surface Ozone, which of the following do play an important role?
(a) Oxides of nitrogen
(b) Oxides of sulphur
(c) Sunlight
(d) Carbon monoxide
Choose the correct answer from the code given below:
(a), (c), (d)
Surface ozone (ground-level or tropospheric ozone) is a secondary pollutant. Unlike stratospheric ozone, it is not emitted directly but is formed near the ground through photochemical reactions among precursor pollutants in the presence of sunlight.
The key ingredients are the oxides of nitrogen (NOx), volatile organic compounds and carbon monoxide, which react in the presence of solar ultraviolet radiation (sunlight) to generate ozone. Carbon monoxide and hydrocarbons supply the reactive carbon species, oxides of nitrogen cycle to release the oxygen atom that combines with O2 to form O3, and sunlight provides the energy that drives the photochemistry. Therefore the trio that plays the important role is oxides of nitrogen, sunlight and carbon monoxide.
The choice built around oxides of nitrogen, oxides of sulphur and sunlight is wrong because oxides of sulphur are chiefly responsible for acid rain and particulate haze, not for photochemical ozone formation. The set of oxides of sulphur, sunlight and carbon monoxide is wrong for the same reason, since it drops the essential oxides of nitrogen and wrongly adds sulphur oxides. The set of oxides of nitrogen, oxides of sulphur and carbon monoxide is wrong because it omits sunlight, without which the photochemical reaction that creates ozone cannot proceed.
Correct answer: (a), (c), (d)
Similar Questions
Give below are two statements:
Statement I : Thermal pollution, usually effluent from cooling systems of power plants or other industries, alters water temperature in a lake or stream.
Statement II : Humans also cause thermal pollution by altering vegetation cover and run-off patterns.
In the light of the above statements, choose the correct answer from the options given below:
Major contributor to carbon monoxide emissions in metropolitan areas of India is/are:
The most important pollutants that cause degradation of water quality in rivers and streams are
(a) Bacteria
(b) Nutrients
(c) Metals
(d) Total dissolved solids
(e) Algae
Choose the most appropriate answer from the options given below:The most dominant source of Benzene emissions in ambient air is
Major sources of oxygen demanding waste in fresh water systems are
(a) Agricultural run-off
(b) Food processing
(c) Ore mining
(d) Sewage effluent
(e) Landfill sites
Choose the correct option from those given below: -
Which of the following pollutant gases is not produced both naturally and as a result of industrial activity?
Which of the following pollutants is the major cause of respiratory diseases?
Assertion (A): In urban areas, smog episodes occur frequently in winters.
Reason (R): In winters, a lot of biomass is burnt by people for heating purposes or to keep themselves warm.
Choose the correct answer from the code given below:
With increase in temperature, the dissolved oxygen content in a water body will:
The most harmful types of environmental pollutants are:
Important Questions from Pollution
Which of the following isnota common component of photo-chemical smog?
Which of the following is NOT the main objective of Ganga action plan?
Which of the following pollutants causes water pollution ?
Presence of which pathogenic microbe in water is indication of contamination?
Which of the following isnota vehicular pollutant?
