The type of iron obtained from a blast furnace in the extraction of iron is:

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.

Explain the extraction of elements by oxidation.

$Aluminium$ oxide is not reduced by chemical reactions since:

Which zone of the blast furnace has the highest temperature?

$A$ layer of coke is spread over bauxite during the electrolytic reduction of alumina by the Hall-Heroult process. This layer acts as a/an: