Answer Posted / vinod sharma
An unstable, poisonous allotrope of oxygen, O3, that is
formed naturally in the ozone layer from atmospheric oxygen
by electric discharge or exposure to ultraviolet radiation,
also produced in the lower atmosphere by the photochemical
reaction of certain pollutants. It is a highly reactive
oxidizing agent used to deodorize air, purify water, and
treat industrial wastes.
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Sir,I am rajkumar..I can completed b.tech with it branch i can apply for entrance exan ONGC graduation daharadun.In this exam sep 18.Its ok but iknow doubt sir...in this exam 1)general awarness butgeneral awareness and knowlege it same syllabus sir.... and how prepare general awareness ongc exam ....ple guid me sir send email chilukoti.rajkumar@gmail.com.and what books can be prepare tell fast sir..send me... thank you