In the MacArthur-Forrest process,which element is used to extract silver from the solution of $Na[Ag(CN)_2]$?

In the $Hall-Heroult$ process,aluminium is formed at the cathode. The cathode is made out of

Iron is obtained on a large scale from $Fe_2O_3$ by

Which substance is used to provide a basic lining in a furnace?

Given below are two statements.
Statement $I:$ The choice of reducing agents for metals extraction can be made by using Ellingham diagram,a plot of $\Delta G$ vs temperature.
Statement $II:$ The value of $\Delta S$ increases from left to right in Ellingham diagram.
In the light of the above statements,choose the most appropriate answer from the options given below:

For the electrolytic production of aluminium,$(i)$ the cathode and $(ii)$ the anode are made of