2nd Year Chemistry Chapter 16 Environmental Chemistry Notes

chemistry 12th notes chapter No 16

1. The mean residence time of methane in the atmosphere:


2. Which one of the following is not the affect of acid rain?


3. In clean water, molecular oxygen ranges from:


4. BOD is connected with:


5. The boiling point of Ozone is very:


6. Which of the following is not common domestic materials which are recycled:


7. Which of the following air pollutants is quiet killer:


8. Photochemical smog consists of high concentration of:


9. Biochemical oxygen demand is the capacity of organic matter in natural water to consume oxygen with in a period of:


10. Half of the ozone over Antarctica has been depleted up to the year:


11. To avoid, formation of toxic compounds with chlorine which of the  followings is better to use as a disinfectant of water:


12. Increasing skin cancer and high mutation rate are due to:


13. The concentration of dissolved oxygen in water ranges from:


14. Lithosphere extends in Earth up to the depth of:


15. Ozone depletion in stratosphere results in:


16. Pollutant of automobile exhausts that affects nervous system and produces mental disease is:


17. When ground water seeps in the landfill a mixture of dissolved, suspended  and microbial contaminants is formed, this mixture is called:


18. Fungicides are the pesticides which:


19. Increased asthmatic attacks in certain seasons are related to :


20. Atmosphere of big/metropolitan cities is polluted most by:


21. The pH of unpolluted rain water should be:


22. The region of earth capable of supporting life is called:


23. Chief air pollutant which is likely to deplete Ozone layer:


24. The fresh water being used for domestic purpose is:


25. Disinfection of water by chlorine is done by the production of:


26. Chlorofluorocarbon releases _____ harmful to ozone:


27. SO₂ and NO₂ produce air pollution in the form of:


28. The residence time of NO in atmosphere is:


29. Carbon monoxide is a pollutant as it:


30. Which one of the following diseases is not eradicated by the pesticides:


31. The normal amount of overhead Ozone is about:


32. A single chlorine free radical can destroy how many ozone molecules:


33. The main pollutant of leather tanneries in the waste water is due to the salt  of:


34. In human liver which substance cause cancer:


35. Which of the following is considered as cause of pollution:


36. Acid rains are produced by:


37. The yellow colour in photochemical smog is due to the presence of:0


38. The mean residence time of methane (CH₄) in atmosphere is:


39. Water pollution is mainly due to


40. Which of the following is primary pollutant:


41. The smog which has high contents of SO₂ in it, is called:


42. Lithosphere is mainly made up of 11 elements, the element found in highest percentage is:


43. How much Earth’s water is present in Oceans:


44. Which method is used to remove permanent hardness of water:


45. C.O.D of water can be determined directly:


46. The cause of water pollution is:


47. The coagulant used in the purification of potable water is:


48. Atmospheric pollutant is:


49. Which part of atmosphere is near to the earth:


50. The temperature in the incinerator of industrial waste products has a range:


51. Synthetic organic chemicals can cause which of the following problems:


52. UV radiations bring about:


53. The thickness of atmosphere is:


54. Result of ozone hole is


55. Cracking of Polyethene at high temperature gives:


56. Pollution is:


57. The recycling of plastic involves:


58. The most abundant element in the earth crust is:


59. Water is often treated with chlorine to:


60. In which of the following layer of atmosphere there is more thickness of  ozone:


61. The pH value of the acid rain is in the range of:


62. Ozone hole refers to:


63. BOD is:


64. Newspaper can be recycled again and again for how many times?


65. In which layer of the atmosphere is Ozone present:


66. Chlorofluorocarbons play an effective role in removing O₃ in the:


67. Half of the mass of the atmosphere is concentrated in lower:


68. Component of environment which consists of all water bodies is:


69. Which one of the following is not a pollutant:


70. Following is better to disinfect water:


71. Co-ordination number of Fe in [Fe(Cₙ)₆]₄:


72. Which causes water pollution:


73. Peroxyacetyl nitrate (PAN) is an irritant to human beings and it affects:


74. The gas that binds strongly with hemoglobin is:


75. Detergent greatly affects:


76. Which one is most toxic?


77. The Ozone layer is:


78. Ozone hole is largest over:


79. How much fresh water is used for domestic purpose:


80. The residual ash after incineration of industrial waste is disposed off in a landfill, which is lined with:


81. Atmosphere contains carbon dioxide:


82. Ozone depletion is mainly due to the reaction of ozone (O₃) with:


83. Which of following is three times lighter than air:


84. Environmental pollution affects:


85. Which of the following factors help to measure quality of water:


86. Ecosystem is a smaller unit of:


87. In purification of potable water the coagulant used is:


88. Which one is secondary pollutant?


Short Questions

1. Name the components of environment.
2. CO is primary air pollutant. Write its poisoning effect on humans.
3. Explain the term BOD ?
4. How acid rains and temporary acid rains are produced? How they pollute water bodies?
5. How atmosphere behaves with behaves with different types of radiations from the sun?
6. How can we do the chlorination of water to purify it?
7. How chlorofluorocarbons destroy the ozone layer? Or what is ozone layer depleting?
8. How CO is produced in different reactions?
9. How COD is measured?
10. How detergents are threat to aquatic life?
11. How do you discuss the poisoning of CO?
12. How does ozone act as a pollutant?
13. How is oil spillage affecting the marine life?
14. How live stock waste become responsible for water pollution?
15. How pesticides contaminate the soil?
16. How the acid rain produces pollution problem?
17. How the animal life is affected by hydrocarbons?
18. How the chlorinated hydrocarbons are dangerous for health?
19. How the concentration of ozone varies on the earth?
20. How the gases in the atmosphere absorb?
21. How the suspended impurities can be coagulated with water?
22. How water in the hydrosphere is distributed in different parts?
23. How water is polluted by petroleum?
24. Hwo does ozone protects the earth from U.V radiations?
25. Mention the utilities of gases of atmosphere?
26. What are detergents? What are their various types? How they act as pollutants?
27. What are ecosphere and hydrosphere?
28. What are environmental pollutants and what is the reason for environmental pollution?
29. What are Landfills?
30. What are leachates and what they contain?
31. What are leachates?
32. What are overall result of photochemical smog?
33. What are pesticides? Give their types:
34. What are the components of environment?
35. What are the harmful effects of chlorination of water?
36. What are the main source of SO₂ as air pollutants?
37. What are the main sources of CO?
38. What are the primary air pollutants?
39. What are the secondary air pollutants?
40. What are the secondary pollutants?
41. What are the side effects of incineration?
42. What are the sources of methane as air pollutants?
43. What are the stages of water treatments?
44. What are the various sources which contaminate water?
45. What do you know about chemical oxygen demand (C.O.D)?
46. What do you mean by aeration of raw water?
47. What happens to the human body when it is exposed to CO?
48. What is acid rain? Give one of its harm to buildings.
49. What is biosphere/ecosphere?
50. What is biosphere?
51. What is BOD?
52. What is COD?
53. What is depolymerization of plastic? Where it is used?
54. What is effect of aeration on quality of raw water?
55. What is lithosphere? Give its composition?
56. What is meant by dissolved oxygen or D.O to check the quality of water?
57. What is oil spoilage?
58. What is overall result of photochemical smog?
59. What is photochemical smog? Give its properties?
60. What is reducing smog? Give its sources:
61. What is smog?
62. What is the composition of atmosphere and its thickness?
63. What is the effect of acid rain on earth?
64. What is the environmental chemistry and which aspects do we study in this branch?
65. What is the purpose of ozone and what is the ozone hole?
66. What is the rain or acid deposition?
67. What is the role of chlorofluorocarbons in destroying ozone?
68. Which are the metal pollutants of industry? How leather industry pollutes water?
69. Which diseases have been irradiated by pesticides?
70. Which oxides of nitrogen are air pollutants? What are their sources?
71. Write a note on hydrosphere.

Long Questions

1. Name components of environment Give approximate composition of atmosphere and lithosphere.
2. Describe natural and human activities that cause pollution due to the following: i) Carbon monoxide ii) Hydrocarbons
3. What is smog? Explain the pollutants which are the main causes of smog.
4. What is Smog? Give conditions for the formation of a smog.
5. What is acidic rain? How does it affect our environment?
6. Write a note on smog.
7. Why is ozone layer depleting? What will happen when the concentraion of ozone will be decreased.
8. Describe the role of Chloroflurocarbons in destroying Ozone.
9. What is meant by acid rain? How is it formed? Give its effects.
10. How can water be purified?
11. How pesticides are dangerous to human being?
12. What are pesticides? Explain how pesticides are dangerous to human beings.
13. Write a note on oil spillage.
14. Explain how pesticides are dangerous to human beings?
15. What do you know about water pollution? How is water polluted by industrial effluents?
16. What are the main sources from which Surface and Ground water is polluted. (Write only four)
17. How water is purified i.e. made potable by aeration and coagulation?
18. Explain the process of incineration of industrial waste.
19. Describe the hydrosphere and lithosphere of environment?
20. Write note on (i) Hydrosphere (ii) Biosphere

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