$A$ flux is used to remove . . . . . . .

Extraction of lead by reduction methods is done by

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

Copper is extracted from sulphide ore using the method:

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.