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Question

Gases referred as 'greenhouse gases' are:
  1. CO2, O2, NO2, NH3
  2. chlorofluorocarbon, CO2, NH3, N2O
  3. CH4, N2, CO2, NH3
  4. chlorofluorocarbon, CO2, CH4, N2O

A
CO2, O2, NO2, NH3
B
CH4, N2, CO2, NH3
C
chlorofluorocarbon, CO2, CH4, N2O
D
chlorofluorocarbon, CO2, NH3, N2O
Solution
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The most significant greenhouse gases are water vapour (H2O), carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Chlorofluorocarbons (CFCs), once used as refrigerants and aerosol propellants until they were phased out by international agreement, are also greenhouse gases.

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