State reason for the following `:`    (i) Lemon is used for restoring the shine of tarnished
Channel: Doubtnut
Date: 12/04/2020

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 wire are used in electrical connections.