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31.

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

the interaction of UV radiation with oxygen

The formation of ozone in the stratosphere takes place by the interaction of O₂ molecules with high energetic ultraviolet radiation.

O₂ $\to$ O + O

O + O₂ $\to$ O₃

33.

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