In the upper atmosphere ....... becomes ozone , a substance that protects the earth from UV radiation and makes life on land possible.
Water vapour
Carbondioxide
Oxygen
Nitrogen
A
Nitrogen
B
Oxygen
C
Water vapour
D
Carbondioxide
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Solution
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The correct option is B Oxygen Ozone is a gas found in the atmosphere consisting of three oxygen atoms: O3. Ozone is formed in the atmosphere when energetic ultraviolet (UV) radiation dissociates molecules of oxygen, O2$ , into separate oxygen atoms. Free oxygen atoms can recombine to form oxygen molecules but if a free oxygen atom collides with an oxygen molecule, it joins up, forming ozone.
So, the correct answer is 'Oxygen'.
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