Short Answer Type
Long Answer TypeDiscuss pollution caused by CO.
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What are different sources of CO pollution? What are the effects of continuous exposure to CO on human beings?
Short Answer TypeExplain giving reasons: There presence of CO reduces the amount of haemoglobin available in the blood for carrying oxygen to the body cells.
Long Answer TypeShort Answer TypeLong Answer TypeDiscuss sources and sinks of CO2 in the atmosphere.
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Discuss the role of CO2 as a pollutant.
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Carbon dioxide is inert and harmless gas, yet it is considered to be a serious pollutant. Explain.
Discuss air pollution caused by oxides of nitrogen.
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What are the principal environmental effects of NO2?
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Name the oxide of nitrogen present in the atmosphere. What are the sources and sinks of NOx?
Discuss measures for the control of NOX pollution.
(i) NO2 gas is acidic in nature. So, it can be removed by using an alkaline solution containing Ca(OH)2 and Mg(OH)2.
(ii) The flue gases emitted from power plants and industrial units contain oxides of nitrogen along with SO2 gas etc. These gases can be removed by scrubbing the flue gases with H2SO4. The following reaction takes place first. scrubbing the flue gases with H2SO4.
The following reaction takes place first:
Then NO and NO2 gases react to form N2O3 which when scrubbed by H2SO4 gives NOHSO4.
Thus both NO2 and SO2 gases get removed from flue gases.
These cleaned flue gases are harmless and are released to the atmosphere.
(iii) The oxides of nitrogen present in the exhaust gases of internal combination engine are reduced to N2 and NH3 by the use of finely divided platinum as a catalyst.
How does SO2 cause pollution?
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What are the principal environmental effects of SO2?
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Describe sources, sinks and polluting effects of SO2.
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