Environmental Chemistry Book Back Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11-50 km is __________

    (a)

    Troposphere

    (b)

    Mesosphere

    (c)

    Thermosphere

    (d)

    stratosphere

  2. Photo chemical smog formed in congested metropolitan cities mainly consists of

    (a)

    Ozone, SO2 and hydrocarbons

    (b)

    Ozone, PAN and NO2

    (c)

    PAN, smoke and SO2

    (d)

    Hydrocarbons, SO2 and CO2

  3. Ozone depletion will cause

    (a)

    forest fires

    (b)

    eutrophication

    (c)

    bio magnification

    (d)

    global warming

  4. Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using __________

    (a)

    grit chamber

    (b)

    scrubbers

    (c)

    trickling filters

    (d)

    catalytic convertors

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

    (a)

    highly polluted

    (b)

    poor in dissolved oxygen

    (c)

    rich in dissolved oxygen

    (d)

    low COD

  6. 3 x 2 = 6
  7. Which is considered to be earth’s protective umbrella? Why?

  8. What are degradable and nondegradable pollutants?

  9. Explain how does greenhouse effect cause global warming

  10. 3 x 3 = 9
  11. Dissolved oxygen in water is responsible for aquatic life. What processes are responsible for the reduction in dissolved oxygen in water?

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

  13. What are the various methods you suggest to protect our environment from pollution?

  14. 2 x 5 = 10
  15. Ethane burns completely in air to give CO2, while in a limited supply of air gives CO. The same gases are found in automobile exhaust. Both CO and CO2 are atmospheric pollutants
    i) What is the danger associated with these gases
    ii) How do the pollutants affect the human body?

  16. Differentiate the following
    (i) BOD and COD
    (ii) Viable and non-viable particulate pollutants

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