Tag: chemistry

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

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

  1. fossil fuels

  2. biomass

  3. geothermal energy

  4. natural gas
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

 Commercial sources of alkanes include:

  1. coal

  2. natural gas

  3. petroleum

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

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

The correct match is:

   List - I    List - II
 A.  Freons  1.  Rise in temperature of earth's surface
 B.  Ozone  2.  Forms holes in ozone layer
 C.  Carbon dioxide  3.  Protects life from UV raidation
 D.  Sulphur dioxide  4.  Increase in fluoride ion concentration
     5.  Acid rain

  1. A-2, B-3, C-1, D-5

  2. A-3, B-4, C-5, D-2

  3. A-1, B-3, C-4, D-2

  4. A-4, B-2, C-1, D-3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Freons are responsible for the hole in ozone layer.
The life is protected from harmful UV radiation by ozone.
The temperature of earths surface rises due to increase in the level of carbon monoxide, as it is a greenhouse gas. 
Sulphur dioxide causes acid rain.

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

Greenhouse effect is caused by:
i) accumulation of $O _{2}$ in the atmosphere
ii) depletion of $O _{3}$ layer
iii) accumulation of $CO _{2}$ in the atmosphere

  1. i and ii

  2. i only

  3. iii only

  4. i and iii
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Greenhouse effect:

  • The progressive heating up of the surface of the Earth is called the greenhouse effect or global warming.
  • $CO _2$ and $H _2O$ block a part of the heat (IR) emitted by the Earth and reflect it back. Due to this, the Earth's surface gets heated up.
  • 50% of $CO _2$ content of air can increase the surface temperature of the Earth by $3^oC$.
  • In addition to $CO _2$, the other greenhouse gases are $CFC$ (17%), $O _3$ (18%), $NO$ (4%) and water vapour (2%).

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

Which of the following is a set of green house gases?

  1. ${\text{C}}{{\text{H}} _{\text{4}}}{\text{,}}{{\text{O}} _{\text{3}}}{\text{,}}{{\text{N}} _{\text{2}}}{\text{,S}}{{\text{O}} _{\text{2}}}$
  2. ${{\text{O}} _3}{\text{,}}{{\text{N}} _2}{\text{,C}}{{\text{O}} _{\text{2}}}{\text{,N}}{{\text{O}} _{\text{2}}}$
  3. ${{\text{O}} _3}{\text{,N}}{{\text{O}} _2}{\text{,S}}{{\text{O}} _{\text{2}}}{\text{,C}}{{\text{l}} _{\text{2}}}$
  4. ${\text{C}}{{\text{O}} _2}{\text{,C}}{{\text{H}} _4}{\text{,}}{{\text{N}} _2}{\text{O,}}{{\text{O}} _3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and ozone (O3) are all recognized greenhouse gases that contribute to the warming of the Earth's atmosphere.

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

The gas that is not considered as a 'green house gas' is:

  1. $CO _2$
  2. $CH _4$
  3. $O _2$
  4. $O _3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The gases in the atmosphere that absorb radiation are known as "greenhouse gases" (sometimes abbreviated as GHG) because they are largely responsible for the greenhouse effect. 


The greenhouse effect, in turn, is one of the leading causes of global warming. 

The most significant greenhouse gases are water vapor (H2O), carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) and ozone (O3). While oxygen (O2) is the second most abundant gas in our atmosphere, O2 does not absorb thermal infrared radiation to cause greenhouse effect.

Option C is correct.

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

Which of the given option is not correct?

  1. Greenhouse effect is due to high concentration of $CO _2$ in atmosphere
  2. Green house effect is influenced by gases such a $CH _4, O _3$ and chlorofluoro carbons.

  3. Greenhouse effect is responsible for the warming up of the earth

  4. Greenhouse effect is responsible for lowering the level of occans due to high evaporation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option A is correct in context, but the question asks for the 'not correct' statement. Option D is incorrect because the greenhouse effect causes sea levels to rise due to melting ice and thermal expansion, not by lowering ocean levels through evaporation.

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

What is the effect of release of $CO _2$ gas on atmosphere?

  1. Global warming

  2. Photochemical smog

  3. Ozone layer depletion

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

Solution:- (A) Global warming

Extra $C{O} _{2}$ in the atmosphere increases the greenhouse effect. More thermal energy is trapped by the atmosphere, causing the planet to become warmer than it would be naturally. This increase in the Earth's temperature is known as global warming.