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Chemistry (Part-XVI)

📆 May 26, 2025

Total Questions: 50

11. Which gas contributes the most to the greenhouse effect? [S.S.C. Online CHSL (T-I) 8.02.2017 (Shift-II) ]

Correct Answer: (a) Water vapor
Solution:Greenhouse gases are responsible for changes in the planet's atmosphere or climate and for global warming. Greenhouse gases responsible for ozone pollution in the troposphere are water vapor (up to 36-72 percent), carbon dioxide (up to 9-26 percent), methane (up to 4-9 percent), ozone (up to 3-7 percent), nitrous oxides and chlorofluorocarbons.

12. Which of the following constitutes highest percentage of Greenhouse gases? [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-II)]

Correct Answer: (c) Carbon Dioxide
Solution:Greenhouse gases are responsible for changes in the planet's atmosphere or climate and for global warming. Greenhouse gases responsible for ozone pollution in the troposphere are water vapor (up to 36-72 percent), carbon dioxide (up to 9-26 percent), methane (up to 4-9 percent), ozone (up to 3-7 percent), nitrous oxides and chlorofluorocarbons.

13. Which of the following greenhouse gases has the greatest heat-trapping ability? [S.S.C. Online Graduate Level (T-I) 8.09.2016 (Shift-III) ]

Correct Answer: (a) Chlorofluoro carbon
Solution:The heat-trapping ability per molecule, often quantified by Global Warming Potential (GWP). GWP is a measure of how much energy the emissions of 1 ton of a given gas will absorb over a given period of time (usually 100 years), relative to the emissions of 1 ton of carbon dioxide ().

14. The depletion of ozone in the atmosphere has been linked to _____ . [S.S.C. Online Constable GD 19.02.2019 (Shift-II) ]

Correct Answer: (c) Chlorofluorocarbons
Solution:Chlorofluorocarbons (CFCs), are mostly used as refrigerants and destroys the protective layer of ozone (O₃) located in the Earth's atmosphere. Ozone protects Earth from harmful ultraviolet (UV-(B)) rays produced by the Sun. CFCs and HCFCs also heat the Earth's lower atmosphere, causing changes in the global climate.

15. Which one of the following is not a greenhouse gas? [S.S.C. Online CHSL (T-I) 19.01.2017 (Shift-II) ]

Correct Answer: (c) Carbon monoxide
Solution:Greenhouse gases are responsible for changes in the planet's atmosphere or climate and ultimately for global warming. Most of these gases are water vapor, carbon dioxide, nitrous oxide, methane, chlorofluorocarbons, ozone, etc.

16. Which of the following is a greenhouse gas or a gas which can deplete the Ozone layer? [S.S.C. Online CHSL (T-I) 23.01.2017 (Shift-III) ]

Correct Answer: (c) CCI₃F
Solution:Trichlorofluoromethane (CCI₃F) known as freon-11, CFC-11, or R-11, is a colored gas. Since 1996,
R-11 gases have been kept in the category of gases that damage the ozone layer.

17. Which of the following is a greenhouse gas or a gas that can damage the ozone layer? [S.S.C. Online CHSL (T-I) 31.01.2017 (Shift-III) ]

Correct Answer: (c) CHCI₂F
Solution:Dichlorofluoromethane or Freon 21, R-21 is a hydrochlorofluorocarbon, which is responsible for damaging the ozone layer. Its production and use has been banned in the year 2015 under the Montreal Treaty.

18. Which of the following is a greenhouse gas or a gas which can deplete the ozone layer? [S.S.C. Online CHSL (T-I) 1.02.2017 (Shift-I) ]

Correct Answer: (a) N₂O
Solution:N₂O (Nitrous oxide): Nitrous oxide is a powerful greenhouse gas with a GWP of about 265-298 over 100 years. It is also an ozone-depleting substance, though less potent than CFCs and HCFCs. Its natural and anthropogenic emissions (especially from agriculture) are a significant concern for both climate change and ozone layer protection.

19. Which of the following is a greenhouse gas or a gas which can deplete the ozone layer? [S.S.C. Online CHSL (T-I) 7.02.2017 (Shift-I) ]

Correct Answer: (d) CCl₂F₂
Solution: (Dichlorodifluoromethane or CFC-12): This is one of the most well-known and widely used Chlorofluorocarbons (CFCs). It is a very potent greenhouse gas (GWP of 10,200) and a major ozone-depleting substance.

20. Which of the following is a greenhouse gas or a gas that can damage the ozone layer? [S.S.C. Online CHSL (T-I) 31.01.2017 (Shift-II) ]

Correct Answer: (d) CClF₃
Solution: (Chlorotrifluoromethane or CFC-13): This is another Chlorofluorocarbon (CFC). Like other CFCs, it is a very powerful greenhouse gas (GWP of 14,000) and a significant ozone-depleting substance.
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