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Which one of the following chemicals used in a refrigerator
is harmful to the ozone layer in the atmosphere?
(1) Ammonia
(2) Freon gas
(3) Carbon dioxide
(4) Nitrogen
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Answer Posted / guest
( 2 ) Freon gas
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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
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