Tag: air and water pollution control

Questions Related to air and water pollution control

What is the main source of global warming?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $SO _2$

  2. $CO _2$

  3. $H _2SO _4$

  4. $N _2O$

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Correct Option: B
Explanation:

The main source of global warming is carbon dioxide. It causes global warming by trapping heat.

Among the following, which is a greenhouse gas?

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

  1. $H _2$

  2. $O _2$

  3. $H _2O$ vapour

  4. $HCl$

Show answer
Correct Option: C
Explanation:


$H _2O$ vapour or water vapour is a potent greenhouse gas just like carbon dioxide and methane.

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

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

  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

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Correct Option: D
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:

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

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

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

  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

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Correct Option: D
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.

Alkanes are __________ in water.

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

  1. soluble

  2. insoluble

  3. solvent

  4. None of the above

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Correct Option: B
Explanation:

Alkanes (both alkanes and cycloalkanes) are virtually insoluble in water, but dissolve in organic solvents. However, liquid alkanes are good solvents for many other non-ionic organic compounds

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

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

  1. Acid rain

  2. Carbon dioxide emissions

  3. Ash with toxic metal impurities

  4. All of these

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Correct Option: D
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.

Solar energy stored in material such as wood, grain, sugar, and municipal waste is called:

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

  1. fossil fuels

  2. biomass

  3. geothermal energy

  4. natural gas

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Correct Option: B
Explanation:

Biomass contains stored energy. That's because plants absorb energy from the sun through the process of photosynthesis. When biomass is burned, this stored energy is released as heat. Burning biomass releases carbon dioxide.

 Commercial sources of alkanes include:

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

  1. coal

  2. natural gas

  3. petroleum

  4. all of the above

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Correct Option: D
Explanation:

The most important commercial sources for alkanes are natural gas and oil. Natural gas contains primarily methane and ethane, with some propane and butane: oil is a mixture of liquid alkanes and other hydrocarbons.

When the soil of the greenhouse nurseries is sterilized with methyl bromide gas, it leads to a deficiency of:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. cellulose in roots

  2. chlorophyll in green leaves

  3. zinc in plants

  4. iron in red flowers

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Correct Option: C
Explanation:

Greenhouse nursery is a plant nursery where the plants are kept protected by several types of rodent and pest control product. Use of $MeBr$ gas leads to a deficiency of $Zn$ in plants as methyl bromide is very toxic.

Which is responsible for ozone depletion?

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

  1. $CFCs$

  2. Hydrocarbons

  3. $CO _{2}$

  4. $CO$

Show answer
Correct Option: A
Explanation:

The Main Ozone-Depleting Substances        

  1. Chlorofluorocarbons (CFCs)  
  2. Halons  
  3. Methyl Chloroform
  4. Carbon Tetrachloride
  5.  Hydrofluorocarbons (HCFCs)