A) The change of ozone into oxygen is a endothermic reaction.
B) Ozone layer is harmful for us because it stops the rays which are useful for photosynthesis.
C) Ozone layer is useful to us because ozone absorbs the ultra-violet rays of sun.
D) Ozone is a trimolecular linear molecule.
Correct Answer: C
Solution :
Ozone layer is present approximately 20 km above from earth. It is useful to us because it absorbs the ultra-violet rays which are coming from the sun.
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