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Decide how to separate these pure substance? if it is not possible, please write"cannot be separated 1.Oxygen, water,gold, carbon dioxide​

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ERICPINLAC29GO

Explanation:Substance 1 Oxygen cannot be separated. Substance 2 Water can be separated by the process of electrolysis. Substance 3 Gold cannot be separated. Substance 4 Carbon Dioxide can be separated by an electrical process which seperates it into carbon monoxide and oxygen.

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