Question

why highly reactive metals are used as reducing agents​

Answer 1

The reactivity of the metal determines the reduction method used. Reactive metals such as aluminium are extracted using electrolysis, as they are more reactive than the usual reducing agents used. ... Sodium is a very reactive metal, high in the reactivity series, so electrolysis is the method of choice.

Answer 2

they are highly reactive and can displace other metals from their compounds