Gold is extracted by a hydrometallurgical process based on its property:

Refractory materials are generally used in furnaces because

Electrometallurgical process is used to extract

Statement $I :$ Leaching of gold with cyanide ion in absence of air $/$ $O_2$ leads to cyano complex of $Au(III)$.
Statement $II :$ Zinc is oxidized during the displacement reaction carried out for gold extraction.
In the light of the above statements,choose the correct answer from the options given below.

Bessemerization is used in the extraction of

The Ellingham diagram is a graphical representation of