Question practice

1. Environmental
Chemistry

2. 1. Most abundant element on the earthcrust is : [RPSC
2014]
(a) Fe (b) Al (c) Si (d) O

3. 2. In biological fixation of nitrogen, the nitrogen is initially converted into : [RPSC 2014]
(a) HNO3 (b) HNO2 (c) NO2 (d) NH3

4. 3. Exposure to vinyl chloride vapours carries a risk of following cancer : [RPSC
2014]
(a) Liver (b) Lung (c) Bladder (d) Marrow

5. 5. During ozone depletion process in nature by chlorofluorocarbons following free
radicals are formed except the : [RPSC
2014]
(a) Cl
(b) ClO
(c) ClO2

(d) ClO3


6. 6. The greenhouse contribution of following gas is maximum: [RPSC 2014]
(a) O3 (b) CH4 (c) CO (d) CO2

7. 7. Stratosphere lies between : [RPSC 2014]
(a) troposphere and mesosphere (b) thermosphere and mesosphere
(c) thermosphere and exosphere (d) exosphere and mesosphere

8. 8. Which of the following set belongs to greenhouse gases : [RPSC 2014]
(a) CO2, Cl2, H2 (b) CH4, CO, O2
(c) CO2, CH4, N2O (d) chlorofluorocarbons, NH3, SO2

9. 9. In ozone layer a pollutant X under the infulence of ultra violet radiation form chlorine
atoms, which react with ozone molecules to form oxygen gas and Y molecules. X and Y
respectively are: [RPSC 2014]
(a) CCl3F and CIO–
(b) CCl3F and Cl–
(c) CCl4 and CIO2 (d) CC12F2 and CIO

10. 11. The process of conversion of Atmospheric nitrogen into NH3 ion is known as-
[RPSC 2014]
(a) Nitrogen fixation (b) Nitrogen estimation
(c) Nitrogen excretion (d) None of these

11. 12. The human impact called IPAT formula is- [RPSC
2020]
(a) I = P + A + T (b) I = P  A  T (c) I = (d) I =

12. 13. The maximum temperature changes is caused by which of the following green house
gases? [RPSC 2020]
(a) CO2 (b) CH4 (c) N2O (d) CFC-II

13. 14. The only sink of PAN is - [RPSC
2020]
(a) Thermal decomposition (b) Humidity (c) Aerosol (d) NOx

14. 15. In general the number of horizon(s) of soil is/are - [RPSC
2020]
(a) 1 (b) 2 (c) 3 (d) 4

15. 16. The soil that contains sand, silt and clay in almost equal proportion- [RPSC 2020]
(a) Loamy soil (b) Clay loamy soil
(c) Sandy soil (d) Clayey soil

16. 17. The residual dissolved inorganic impurities from the waste water can be removed by –
[RPSC
2020]
(a) Ion-exchange (b) Oxidation
(c) Chlorination Mus (d) Coagulation M

17. 18. For the oxidation of 1 mg of carbon in treatment process of sewage waste water, the
dissolved oxygen required is – [RPSC
2020]
(a) 1 mg (b) 2.67 mg (c) 3.50 mg (d) 4.67 mg

18. 19. The base insoluble fraction of Humus is- [RPSC
2020]
(a) Humic acid (b) Fulvic acid
(c) Humin (d) All of the above

19. 20. Which of the following statements is incorrect for photochemical smog? [RPSC 2020]
(a) Its primary pollutants are organics and NOx
(b) The nature of compounds in it is reducing.
(c) Its secondary pollutants are ozone, PAN, HNO3 and aldehydes.
(d) Its first occurrence was in Los Angeles.

20. 21. The ozone level in the photochemical smog is determined by the rate and efficiency of
production of which of the following radicals? [RPSC 2020]
(a) RO2 (b) HO2 (c) RCOO2 (d) All of the above

21. 22. The activated sludge process in sewage treatment is related to – [RPSC
2020]
(a) Preliminary screening and grit removal
(b) Secondary biological treatment
(c) Secondary sedimentation
(d) Tertiary treatment

22. 23. Which among the following is the most harmful air pollutant that is produced by
automobiles? [RPSC
2024]
(a) CO (b) HNO3 (c) SO2 (d) NO

23. 24. Water pollution is indicated by: [RPSC
2024]
(a) Amount of nitrogen (b) Amount of BOD
(c) Amount of oxygen (d) Amount of hydrogen

24. 25. Blue baby diseases is caused if drinking water has excess amount of: [RPSC 2024]
(a) Nitrate (b) Sulphate (c) Aluminium (d) Cadmium

25. 26. Environmental pollution affects: [RPSC
2024]
(a) Biotic components
(b) Human beings only
(c) Biotic and abiotic components of environment
(d) Plants only

26. 27. The main constituents of acid rain are: [RPSC 2024]
(a) Nitrogen and Hydrogen (b) Sulphur and Oxygen
(c) Carbon and Oxygen (d) Sulphur and Nitrogen

27. 28. Which one of the following is related to green house effect? [RPSC
2024]
(a) Global warming (b) Biodegradable pollutant
(c) Farming of green plants (d) Vegetable farming in houses

28. 29. Maximum prescribed concentration of copper in drinking water is [RPSC
2024]
(a) 0.2 ppm (b) 3.0 ppm (c) 5.0 ppm (d) 0.005 ppm

29. 30. Find the incorrect statement: [RPSC
2024]
(a) BOD value of clean water is. less than 5 ppm.
(b) Drinking water pH should be between 5.5-9.5
(c) Carbon, sulphur and nitrogen oxides are the most widespread air pollutants.
(d) Dissolved oxygen concentration below 4 ppm is ideal for the growth of the fish.

30. 31. Soil organic matter usually ranges in content from [RPSC
2024]
(a) 0.1 to 7% (b) 10 to 14% (c) 10 to 20% (d) 0.01 to 0.07%

31. 32. Which of the following compounds is not found in Photochemical fog? [RPSC
2024]
(a) Nitrogen oxides (b) Ozone
(c) Formaldehyde (d) Chlorofluoro carbons

32. 33. Which of the following methods can be used to measure soil moisture?[MPPSC 2022]
(a) Electrical conductivity (b) Tensitometry
(c) Neutron scattering (d) All of the above

33. 34. The permissible concentration of arsenic in drinking water is [MPPSC
2022]
(a) 0.08 PPM (b) 0.05 PPM
(c) 0.07 PPM (d) 0.09 PPM

34. 35. The maximum concentration of ozone in the stratosphere is [MPPSC 2022]
(a) 5  1010
mol.cm-2
(b) 5  1012
mol.cm-3
(c) 5  1011
mol.cm-2
(d) 5  1019
mol.cm-3

35. 36. How do water soluble radioactive isotopes affect living organisms? [MPPSC
2022]
(a) They are harmless and pass through the ecosystem without impact
(b) They are concentrated in various tissues and organs as they pass through food chains and food webs
(c) They only affect aquatic plants and not animals
(d) They dissipate quickly and do not accumulate in living organisms

36. 37. Pesticides cause negative impact on environment like [MPPSC
2022]
(a) Biomagnification (b) Nitriphication
(c) Mineralization (d) Eutrophication

37. 38. Which of the following statements is true regarding Polycyclic Aromatic Hydrocarbons (PAHs) with three to
five rings? [MPPSC
2022]
(a) They are less toxic in the presence of ultraviolet (UV) light.
(b) They remain non-toxic regardless of exposure to ultraviolet (UV) light.
(d) Their toxicity increases in the presence of ultraviolet (UV) light.
(d) They are only toxic in the absence of ultraviolet (UV) light.

38. 39. The Chernobyl disaster occurred due to which of the following reasons? [MPPSC
2022]
(a) because of nuclear explosion (b) due to flyash emission
(c) due to power plant failure (d) flooding that compromised the cooling systems

39. 40. What is primary cause of photochemical smog formation? [MPPSC
2022]
(a) Ozone and methane in the presence of sunlight
(b) Carbon monoxide and sulfur dioxide emissions
(c) Photochemical reactions involving hydrocarbons, ozone, carbon monoxide and nitrogen oxides
(d) Dust particles and particulate matter in atmosphere

40. 41. _______is biological process caused by the influx of plant nutrients from sewage and
agricultural run-off into water bodies. [MPPSC 2022]
(a) Photosynthesis (b) Eutrophication
(c) Biomagnification (d) Acidification

41. 43. Select the incorrect statement: [UKPSC
2017]
(a) The major culprit in 'ozone depletion' consists of Freons.
(b) Ozone is found more near the poles than at the equator and more abundant in summer than winter.
(c) The maximum ozone concentration is around 10 ppm in the stratosphere at an altitude of 25-30 km.
(d) Ozone is highly unstable relative to oxygen.

42. 44. Photochemical smog is [UKPSC 2017]
(I) Oxidising smog (II) Reducing smog
(III) Formed in summer in day time (IV) Formed in winter in day time
(a) (I) and (IV) are correct. (b) (II) and (IV) are correct.
(c) (1) and (III) are correct. (d) (II) and (III) are correct.

43. 45. The concentration of dissolved oxygen (DO) in cold water can go upto - [HPSC 2018]
(a) 8 ppm (b) 10 ppm (c) 14 ppm (d) 16 ppm

44. 46. Taj Mahal is being slowly disfigured and discoloured. This is primarily due to – [HPSC
2018]
(a) Global warming (b) Soil pollution (c) Water pollution (d) Acid rain

45. ANSWER KEY
1. D 2. D 3. A 4. D 5. D 6. D 7. A 8. C 9. D 10. B
11. A 12. B 13. C 14. D 15. D 16. A 17. A 18. B 19. C 20. B
21. D 22. A 23. B 24. B 25. A 26. C 27. D 28. A 29. A 30. D
31. A 32. D 33. D 34. B 35. C 36. B 37. A 38. C 39. C 40. C
41. B 42. A 43. B 44. C 45. C 46. D