A) \[CFC,C{{H}_{4}},C{{O}_{2}},{{N}_{2}}O\]
B) \[C{{O}_{2}},C{{H}_{4}},{{N}_{2}},{{O}_{2}}\]
C) \[C{{O}_{2}},C{{H}_{4}},{{N}_{2}},{{O}_{3}}\]
D) \[C{{O}_{2}},CFC,{{N}_{2}},{{O}_{2}}\]
Correct Answer: A
Solution :
The concentration of gases like carbon dioxide \[(C{{O}_{2}}),\] methane \[(C{{H}_{4}}),\] nitrous oxide \[({{N}_{2}}O)\] and chloro fluoro carbons (CFCs) are increasing in the lower atmosphere. These gases are called green-house gases because they can absorb long wave infrared radiation. The excessive increase in concentration of these gases in the atmosphere cause a increase in global mean temperature and referred to as global warming. The concentration is summerised as:| Greenhouse Gases | Pre-indu-strial Concent ration 1750 AD | Concent -ration in 2000 AD | Increase since~ 1750 AD% | Atmospheric Life-tim e (years) |
| Carbon dioxide \[(C{{O}_{2}})\] | 280 ppm | 368 ppm | 31 | 5-200 |
| Methan\[(C{{H}_{4}})\] | 700 ppb | 1750 ppb | 151 | 12 |
| Nitrous oxide \[({{N}_{2}}O)\] | 270 ppb | 316 ppb | 17 | 114 |
| Chlorofluoro carbons \[(CFCs)\] | 0 | 282 ppt | 45-260 |
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