Tag: geobiochemical cycle

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Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Gases like methane, nitrous oxide and water vapour also contribute towards greenhouse effect, they are also called ___________.

  1. greenhouse gases

  2. green gases

  3. noble gases

  4. acidic gases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gases like methane, nitrous oxide and water vapour also contribute towards green house effect, they are also called greenhouse gases.

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Which of the following conclusions are made on methane in natural environment?

  1. Methane is produced by methanogenesis in anoxic environment
  2. The concentration of methane is 0.1 to 1.0 $\mu M$ for surface waters of lake

  3. Methane produce in sediment bubbles and diffuses into the water column and is lost to the atmosphere, except during winter months

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Naturally occurring methane is mainly produced by the process of methanogenesis. This multistep process is used by microorganisms as an energy source. The net reaction is:

$C{ O } _{ 2 }+8H++8{ e }^{ - }→C{ H } _{ 4 }+2{ H } _{ 2 }O$

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

The important conclusions on the formation of trihalomethanes are which of the following?

  1. Chlorination of natural waters causes the formation of chloroform and other trihalomethanes because of the reaction of $OCl^-$ on DOC present in the water

  2. Use of both ammonia and chlorine in water treatment has reduced the level of the trihalomethanes due to the formation of the chloroamines, which react more slowly than free chlorine
  3. Finally, the concentration of the trihalomethanes above 100$\mu$ g/l are considered unsafe for drinking water

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chloroform, or trichloromethane, is an organic compound with formula $CH{ Cl } _{ 3 }$. It is a colorless, sweet-smelling, dense liquid.

Important conclusions on the formation of trihalomethanes are :

1. Chlorination of natural waters causes the formation of chloroform and other trihalomethanes because of the reaction of OCl−OCl− on DOC present in the water.

2.Use of both ammonia and chlorine in water treatment has reduced the level of the trihalomethanes due to the formation of the chloroamines, which react more slowly than free chlorine.

3.The concentration of the trihalomethanes above 100μμ g/l are considered unsafe for drinking water.

Multiple choice chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

Which of the following problems is associated with the burning of coal?

  1. Acid rain

  2. Carbon dioxide emissions

  3. Ash with toxic metal impurities

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Coal plants are the nation’s top source of carbon dioxide emissions, the primary cause of global warming. Burning coal is also a leading cause of smog, ash, acid rain, and toxic air pollution.