Electrolysis is used commercially to isolate which metal(s)?

(P) Al     (Q) Fe

Commercial electrolysis is used to separate aluminum metal.

Electrolysis is used for the extraction process. For electricity to flow through the aluminum oxide, the ions must be unrestricted. Since aluminum oxide has a very high melting point (about 2000°C), melting it would be costly. While molten cryolite is still liquid, as a result, aluminum oxide dissolves.

Hence Correct option is A