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Question

Gases commonly referred as green house gases are :
  1. CH4
  2. CO2
  3. NH3
  4. CFC

A
CFC
B
CH4
C
CO2
D
NH3
Solution
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Greenhouse gases absorbs radiations from sun that are reflected back from earth's surface. In this way, they prevent the radiations from escaping. These gases can cause greenhouse effect in which there is warming of earth's surface. Gases like methane (CH4), carbon dioxide (CO2), CFC (Chlorofluorocarbon) and Nitrous oxide (N2O) are greenhouse gases. Excess concentration of greenhouse gases in atmosphere can cause global warming.
So, the correct answer is options 'A, B and C'.

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