Tag: chemistry

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

Which of the following is the natural sources of the most volatile hydrocarbon?

  1. Methane

  2. Ethane

  3. Ester

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Methane is a chemical compound with the chemical formula $C{ H } _{ 4 }$ (one atom of carbon and four atoms of hydrogen). It is a group 14 hydride and the simplest alkane, and is the main component of natural gas.In its natural state, methane is found both below ground and under the sea floor. When it finds its way to the surface and the atmosphere, it is known as atmospheric methane

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

Which of the following is not the source of hydrocarbon as a pollutant?

  1. Man-made sources

  2. Sources of methane

  3. Fly ash

  4. Oxide of sulphur
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxides of sulphur do not combine with any other molecule to give hydrocarbon, while manmade sources like industries, vehicles release hydrocarbon into the atmosphere.

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

Example of primary pollutant:

  1. $SO _2$
  2. $CO _2$

  3. Hydrocarbon
  4. $CO$
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation

Primary Pollutants are the ones which are injected into the atmosphere directly.  Examples include:

  1. Carbon monoxide (CO)
  2. Oxides of nitrogen ($N{ O } _{ x },NO$ )
  3. Sulfur oxides ($S{ O } _{ x }$)
  4. Volatile organic compounds (VOCs)
  5. Particulate matter (dust, ash, salt particles)

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

The principal source of volatile organics (Hydrocarbons) is:

  1. transportation

  2. industrial processes

  3. stationary fuel combustion

  4. volcanoes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ground-level ozone is formed when volatile organic compounds (VOCs), also known as hydrocarbons, and nitrogen oxides ($N{ O } _{ x }$) interact in the presence of sunlight. Sources of VOC and $N{ O } _{ x }$ emissions include:

large industry such as chemical manufacturers, and combustion sources such as power plants burning fossil fuels.

small industry such as gasoline-dispensing facilities, auto body paint shops, and print shops

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

Which chemical substance is a greenhouse gas that scientists link to global climate change?

  1. Nitrogen oxides

  2. Lead

  3. Carbon dioxide

  4. DDT

  5. Nitrates
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

Nitrous oxide $\displaystyle N _2O$ is a greenhouse gas scientists link to global climate change. Following are the sources of nitrous oxide.
(1) Fertilizer use
(2) Fossil fuel combustion
(3) Biomass burning
(4) Changing land use

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

Which of the following are the source for hydrocarbons as pollutants?

  1. Anaerobic bacterial decomposition of organic matter

  2. Forest fires and trees

  3. Combustion of Fuels

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

The following are the source for hydrocarbons as pollutants:
Anaerobic bacterial decomposition of organic matter, forest fires and trees and combustion of fuels. Solvents in industrial operation.
Hence option D is correct.

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

What is the cause of Green house effect?

  1. Infra-red rays

  2. Ultra violet rays

  3. X-rays

  4. Radio waves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The greenhouse gases absorb more of infrared rays and emits heat and this heat cannit be escaped from the atmosphere-resulting in heating up of the earth surface thereby resulting in global warming and hence greenhouse effect.