Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

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

Greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and ozone (O3), all of which trap heat in the atmosphere. Option D correctly lists a complete set of major greenhouse gases.

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

Select the correct statements about greenhouse gases:


A. Carbon dioxide is the only gas in the atmosphere which causes global warming.
B. The greenhouse gases trap heat and do not allow heat to escape into outer space.
C. Water vapours do not contribute to the greenhouse effect.
D. The presence of excessive greenhouse gases in the atmosphere is responsible for global warming.

  1. A and B

  2. B and D

  3. C and B

  4. D and A
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The primary green house gases in earth's atmosphere are water vapour, $CO _2$, $CH _4$, $N _2O$, $O _3$, $CFC$ etc. Thus $CO _2$ is not the only green house gas and water vapours also contribute to global warming.

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

Greenhouse effect causes:

  1. melting of ice caps

  2. rise in the sea level

  3. submerging of low lying areas

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

The greenhouse effect causes the melting of the ice caps and releases other greenhouse gases, $CH _4$ which is heating up the environment and causing the greenhouse effect again. 

Option A is correct.

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

Gases referred as 'greenhouse gases' are:

  1. $CO _2,\ O _2,\ NO _2,\ NH _3$
  2. chlorofluorocarbon, $CO _2,\ NH _3,\ N _2O$
  3. $CH _4,\ N _2,\ CO _2,\ NH _3$
  4. chlorofluorocarbon, $CO _2,\ CH _4,\ N _2O$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The most significant greenhouse gases are water vapour (H$ _2$O), carbon dioxide (CO$ _2$), methane (CH$ _4$) and nitrous oxide (N$ _2$O). Chlorofluorocarbons (CFCs), once used as refrigerants and aerosol propellants until they were phased out by international agreement, are also greenhouse gases.

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

Which of the following is not a green house gas?

  1. Carbon dioxide

  2. Water vapour

  3. Oxygen

  4. Methane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Green house gases (GHGs) are gaseous components of the atmosphere that contribute to the 'green house effect'. A greenhouse gas is any gaseous compound in the atmosphere that is capable of absorbing infrared radiation, thereby trapping and holding heat in the atmosphere. By increasing the heat in the atmosphere, greenhouse gases are responsible for the greenhouse effect, which ultimately leads to global warming. Some greenhouse gases occur naturally in the atmosphere, while others result from human activities. Naturally occurring greenhouse gases include water vapour, carbon dioxide, methane, nitrous oxide and ozone. Certain human activities, however, add to the levels of most of these naturally occurring gases.

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

Deforestation leads to an increase in the amount of $CO _2$ in the air:

  1. because the number of trees which consume $CO _2$ is increased
  2. because the number of trees which consume $CO _2$ is reduced
  3. because the number of trees which fix $CO _2$ is reduced

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

Deforestation leads to an increase in the amount of $CO _2$ in the air because the number of trees which consume $CO _2$ is reduced.