12th Class Chemistry Mcqs With Answers Chapter 16| 2nd Year chemistry mcqs with answers pdf

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12th Class Chemistry Mcqs With Answers Chapter 1


Chapter No 16

Environmental chemistry

1. Synthetic organic chemicals can cause which of the following problems choose which one is correct:

  1. Nausea
  2. Dizziness
  3. Blindness
  4. All of the above

2. Which of the following is considered as cause of pollution choose which one is correct:

  1. Rapid increase in population
  2. Industrialization
  3. Transportation
  4. All of the above

3. Which of the following is primary pollutant choose which one is correct:

  1. H2SO4
  2. N2O
  3. H2CO3
  4. SO2

4. In which of the following layer of atmosphere there is more thickness of  ozone choose which one is correct:

  1. Troposphere
  2. Stratosphere
  3. Mesosphere
  4. Thermosphere

5. Which of the following air pollutants is quiet killer choose which one is correct:

  1. CO2
  2. CO
  3. NO2
  4. N2O4

6. The cause of water pollution is choose which one is correct:

  1. Presticides
  2. Detergents
  3. Tanneries
  4. All

7. The pH value of the acid rain is in the range of choose which one is correct:

  1. 6.5 − 7.0
  2. Less than 5.6
  3. Less than 5.0
  4. Less than 7.0

8. Which of the following factors help to measure quality of water choose which one is correct:

  1. DO
  2. BOD
  3. COD
  4. All of above

9. Which method is used to remove permanent hardness of water choose which one is correct:

  1. Aeration
  2. Coagulation
  3. Ion exchange
  4. Chlorination

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

  1. O3
  2. ClO3
  3. Both
  4. None

11. Peroxyacetyl nitrate (PAN) is an irritant to human beings and it affects choose which one is correct:

  1. Eyes
  2. Ears
  3. Stomach
  4. Nose

12. A single chlorine free radical can destroy how many ozone molecules choose which one is correct:

  1. 100
  2. 10,000
  3. 10,00,000
  4. 100,000

13. Ecosystem is a smaller unit of choose which one is correct:

  1. Lithosphere
  2. Hydrosphere
  3. Biosphere
  4. Atmospheric

14. The coagulant used in the purification of potable water is choose which one is correct:

  1. Alum
  2. Nickle sulphate
  3. Copper sulphate
  4. Barium sulphate

15. Newspaper can be recycled again and again, by how many times choose which one is correct:

  1. 2
  2. 3
  3. 4
  4. 5

16. Which of the following is not common domestic materials which are recycled choose which one is correct:

  1. Paper
  2. Iron
  3. Glass
  4. Plastics

17. The normal amount of overhead ozone is about choose which one is correct:

  1. 335 DU
  2. 340 DU
  3. 345 DU
  4. 350 DU

18. When ground water seeps in the landfill a mixture of dissolved, suspended  and microbial contaminants is formed, this mixture is called choose which one is correct:

  1. Rancidity
  2. Incinerate
  3. Refuse
  4. Leachate

19. The gas that binds strongly with hemoglobin is choose which one is correct:

  1. Carbon monoxide
  2. Carbon dioxide
  3. Methane
  4. Nitrogen oxide

20. The concentration of dissolved oxygen in water ranges from choose which one is correct:

  1. 4−8 ppm
  2. 6−10 ppm
  3. 8−10 ppm
  4. 0.4−0.8 ppm

21. Fungicides are the pesticides which choose which one is correct:

  1. Kill insects
  2. Kill fungus
  3. Kill plants
  4. Kill herbs

22. The main pollutant of leather tanneries in the waste water is due to the salt  of choose which one is correct:

  1. Lead
  2. Chromium (III)
  3. Chromium (VI)
  4. Copper

23. The temperature in the incinerator of industrial waste products has a range choose which one is correct:

  1. 900−1000°C
  2. 250−500°C
  3. 950−1300°C
  4. 500−900°C

24. Which part of atmosphere is near to the earth choose which one is correct:

  1. Thermosphere
  2. Troposphere
  3. Mesosphere
  4. Stratosphere

25. Thickness of atmosphere is choose which one is correct:

  1. 100 km
  2. 500 km
  3. 1000 km
  4. 1500 km

26. How much fresh water is used for domestic purpose choose which one is correct:

  1. 8%
  2. 23%
  3. 69%
  4. 100%

27. The most abundant element in the earth crust is choose which one is correct:

  1. O
  2. Si
  3. Al
  4. Fe

28. The residence time of NO is choose which one is correct:

  1. Few hours
  2. 1day
  3. 3 days
  4. 4 days

29. The mean residence time of methane (CH4) in atmosphere is choose which one is correct:

  1. 1−2 years
  2. 3−4 years
  3. 3−5 years
  4. 3−7 days

30. The yellow colour in photochemical smog is due to the presence of choose which one is correct:0

  1. NO
  2. NO2
  3. SO2
  4. CO2

31. Ozone depletion is mainly due to the reaction of ozone (O3) with choose which one is correct:

  1. O2
  2. CFCs
  3. SO2
  4. All of these

32. In human liver which substance cause cancer choose which one is correct:

  1. Chloroform
  2. Methane
  3. Carbon dioxide
  4. H2SO3

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