Question

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.

Answer 1

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.

Answer 2

Copper wires are good conductor of electricity so they are used in electrical connections