In the manufacture of metallic sodium by the fused salt electrolysis $(Down's \ process)$,a small amount of calcium chloride is added to:

The Ellingham diagram represents a plot of:

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 role of flux in metallurgical processes?

The inner layer of a blast furnace is made of:

$AgCl$ on fusion with sodium carbonate,gives