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B
for dissolving impurities in metallurgical process
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C
as local anaesthetic
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D
in printing industry
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Solution
The correct option is A in refrigerator Freon is also known as chlorofluorocarbons. The structure of freon is:
It is used in
1) Aerosol Propellants
2) Regrigerators
3) Air-conditioners
Hence, the correct answer is option (a).