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State reason for the following:

(i) Lemon is used for restoring the shine of tarnished copper vessels.
(ii) A metal sulphide is converted into its oxide to extract the metal from the sulphide ore.
(iii) Copper wires are used in electrical connections.


I) lemon is acidic
ii) it's easier to convert them from their oxides to metals while harder to extract directly
iii) they have low resistance.
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