When a metal is to be extracted from its ore,if the gangue associated with the ore is silica,then

Bessemerization is involved in the extraction of which metal?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: In the Ellingham diagram,a sharp change in slope of the line is observed for $Mg \rightarrow MgO$ at $\sim 1120^{\circ} C$.
Reason $R$: There is a large change of entropy associated with the change of state.
In the light of the above statements,choose the correct answer from the options given below.

Which metal is used as a reducing agent in smelting?

Explain the extraction of elements by oxidation.

The cyanide process is used for obtaining