Tag: chemistry

Questions Related to chemistry

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

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

  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. ${\text{C}}{{\text{O}} _2}{\text{C}}{{\text{H}} _{4,}}{N _2}O,\,{O _3}$

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Correct Option: C

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.

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

  1. A and B

  2. B and D

  3. C and B

  4. D and A

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Correct Option: B
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.

Greenhouse effect causes:

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

  1. melting of ice caps

  2. rise in the sea level

  3. submerging of low lying areas

  4. All of the above

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Correct Option: A
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.

Gases referred as 'greenhouse gases' are:

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

  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, $CO _2,\ CH _4,\ N _2O$

Show answer
Correct Option: D
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.

Global warming is the result of the increase in ________ in air.

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

  1. nitrogen

  2. oxygen

  3. water vapour

  4. carbon dioxide

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Correct Option: D
Explanation:

The $CO _2$ is a gas which traps heat and let to the glaciers to melt, which cause an increase in global warming.

Which of the following gases cause the harmful green house effect?

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

  1. Hydrogen

  2. Oxygen

  3. Carbon dioxide

  4. Nitrogen

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Correct Option: C
Explanation:

Gases which cause green house effect are:

$1.$ Water vapour $(H _2O)$
$2.$ Carbon dioxide $(CO _2)$
$3.$ Methane $(CH _4)$
$4.$ Nitrous oxide $(N _2O)$
$5.$ Chlorofluro carbon $(CFCs)$

Which of the following is not a green house gas?

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

  1. Carbon dioxide

  2. Water vapour

  3. Oxygen

  4. Methane

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Correct Option: C
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.

Carbon dioxide is the major component of greenhouse gases.

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

  1. True

  2. False

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Correct Option: B
Explanation:

There are several other gases like $H _2O, CH _4, N _2O, CFC _s$ and $CO$, are responsible for the greenhouse effect. 

Carbon dioxide is also component of greenhouse gases but it is not a major component.

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

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

  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

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Correct Option: B
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.

Which of the following is one of the gases responsible for green house effect?

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

  1. $CO _2$

  2. $H _2S$

  3. $N _2$

  4. None of the above

Show answer
Correct Option: A
Explanation:

$CO _2$ is one of the gases responsible for the greenhouse effect effect.