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Environmental Chemistry Important Questions

11th Standard

    Reg.No. :


Answer all the questions 

Time : 01:40:00 Hrs
Total Marks : 50

    Part A

    5 x 1 = 5
  1. Which sequence for green house gases is based on GWP?


    CFC > N2O > CO2 > CH4


    CFC > CO> N2O > CH4


    CFC > N2O > CH4 > CO2


    CFC > CH4 > N2O > CO2

  2. Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be


    highly polluted


    poor in dissolved oxygen


    rich in dissolved oxygen


    low COD

  3. Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted
    Reason(R) : High biological oxygen demand means high activity of bacteria in water


    Both (A) and R are correct and (R) is the correct explanation of (A)


    Both (A) and R are correct and (R) is not the correct explanation of (A)


    Both (A) and R are not correct


    (A) is correct but( R) is not correct

  4. High concentration of lead in human blood damages






    Both (a) & (b)


    Neither (a) nor (b)

  5. Green house gases cause


    Increase in temperature of atmosphere


    Prevents global warming


    Trap UV rays


    All the above

  6. Part B

    5 x 2 = 10
  7. What would happen, if the greenhouse gases were totally missing in the earth’s atmosphere?

  8. Which is considered to be earth’s protective umbrella? Why?

  9. A person was using water supplied by corporation. Due to shortage of water he started using underground water. He felt laxative effect. What could be the cause?

  10. Write a short note on global warming.

  11. Name any four methods of waste management

  12. Part C

    5 x 3 = 15
  13. From where does ozone come in the photo chemical smog?

  14. Explain how oxygen deficiency is caused by carbon monoxide in our blood? Give its effect

  15. Bring out the differences between classical and photochemical smog

  16. Discuss the harmful effects of improper waste management in the city

  17. Write the impact of depletion of ozone layer on plants, human and aquatic life.

  18. Part D

    4 x 5 = 20
  19. How does classical smog differ from photochemical smog?

  20. How is acid rain formed? Explain its effect

  21. (i) How does pollutants vary from contaminants?
    (ii) Classify the pollutants on the following basis & give examples.
    Depending on their physical state
    Depending upon their degradability.
    Depending on their formation and existence in nature.

  22. What is water pollution? Give a detailed account on causes and harmful effects of water pollution.


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