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Environmental Chemistry

Short Answer Type

51. Explain tropospheric pollution in 100 words.

463 Views

Long Answer Type

52.

Discuss pollution caused by CO.
Or
What are different sources of CO pollution? What are the effects of continuous exposure to CO on human beings?

113 Views

Short Answer Type

53.

Explain giving reasons: There presence of CO reduces the amount of haemoglobin available in the blood for carrying oxygen to the body cells.

128 Views

Long Answer Type

54.

Discuss measures for the control of CO pollution.

112 Views

Short Answer Type

55.

Carbonmonoxide gas is more dangerous than carbondioxide. Why?

194 Views

Long Answer Type

56.

Discuss sources and sinks of CO₂ in the atmosphere.
Or
Discuss the role of CO₂ as a pollutant.
Or
Carbon dioxide is inert and harmless gas, yet it is considered to be a serious pollutant. Explain.

148 Views

57.

Discuss air pollution caused by oxides of nitrogen.
Or
What are the principal environmental effects of NO₂?
Or
Name the oxide of nitrogen present in the atmosphere. What are the sources and sinks of NO_x?

115 Views

58.

Discuss measures for the control of NO_X pollution.

103 Views

59.

How does SO₂ cause pollution?
Or
What are the principal environmental effects of SO₂?
Or
Describe sources, sinks and polluting effects of SO_2.

159 Views

60.
Discuss measures for the control of SO_x pollution.

(i) Removal of sulphur from the fuel before combustion: A number of processes are employed. The pyrites from coal can be eliminated by physical techniques such as grinding followed by washing. Organic sulphur in coal can be removed by carbonization, liquefaction or gasification.
(ii) Removal of SO_x from flue gases: A number of methods are employed as.
(a) Limestone method: CaCO₃ is added directly to the boiler where quick lime is formed.

Quicklime (CaO) reacts with SO_xin the flue gases to form calcium sulphite and calcium sulphate.

Calcium sulphite and calcium sulphate are removed and disposed of.

(b) Lime slurry method: Sulphur dioxide is passed through lime slurry where calcium sulphite is formed.

The waste CaSO₃ can be used to prepare gypsum by oxidation of CaSO₃.

(c) Magnesium oxide slurry method: Sulphur dioxide may be removed by using magnesium oxide for scrubbing.

(iv) Sodium hydroxide method: Sulphur dioxide can be removed by first treating with sodium hydroxide and then with calcium hydroxide.