Yes, it is amphoteric, at the same time it behaves like acid AND like base: it acts as an acid when in a base: ZnO(s) + 2OH-(aq) +H20(l) -> [Zn(OH)4]2-(aq) it reacts as a base when in acid: ZnO(s)...
reduced?
depends on if copper and zinc are magnetic or not, because then you could use a strong magnet to separate them. lol this sounds like science homework
Zinc
Any metal oxide, for example magnesium oxide.