What does the slag obtained during the extraction of copper mainly consist of?

During the electrolytic reduction of alumina,the reaction at the cathode is:

From argentite $(Ag_2S)$ ore,the method used in obtaining metallic silver is:

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:

What is the slag formed during the extraction of iron?

Which of the following processes involves smelting?