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31.

Among the following, the one which is not a "green house gas", is

  • N2O

  • CO2

  • CH4

  • O2


D.

O2

O2 is not a green house gas because it does not have the ability to trap thermal radiation. N2O, CO2 and CH4 have the ability to trap the thermal radiation.


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32.

The ozone layer forms naturally by :

  • the interaction of CFC with oxygen

  • the interaction of UV radiation with oxygen

  • the interaction of IR radiation with oxygen

  • the interaction of oxygen and water vapour


33.

Among the following, the one that is not a green house gas is:

  • Methane

  • Ozone

  • Sulphur dioxide

  • Nitrous oxide


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