In the aluminothermite process,aluminium acts as:

Out of $C$ and $CO$,which is a better reducing agent at $673 \, K$?

In a blast furnace,iron oxide is reduced by:

Alumino-thermic process is used for the extraction of metals,whose oxides are

Consider the following metallurgical processes:
$(i)$ Heating impure metal with $CO$ and distilling the resulting volatile carbonyl (boiling point $43\,^{\circ}C$) and finally decomposing at $150\,^{\circ}C$ to $200\,^{\circ}C$ to get the pure metal.
$(ii)$ Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide.
$(iii)$ Electrolysing the molten electrolyte containing approximately equal amounts of the metal chloride and $CaCl_2$ to obtain the metal.
The processes used for obtaining sodium,nickel and copper are,respectively,

Suggest a list of metals that are extracted electrolytically.