which gas is used in refrigerator and air conditionor . 1. liquid ammonia 2.sulphur dioxide 3. cfc or hfc . and if the answer is option 3. plz tell me why in the screenshot it is written that option 2 and option 1 are used in redrigeration systems.( in 2 nd point of the heading "other uses of liquefaction of gases" )
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answer is option 3.............
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