Question

explain why reactive metals Al Mg are used as reducing agent s
give fast answer pls​

Answer 1

There is only one case above that demonstrates a stronger reducing agent than zinc: Mg. when you react Zn with Mg2+, nothing happens, so Mg2+ doesn't get oxidized or reduced. If you react Mg with Zn2+, then the reaction goes because Mg will get oxidized and donate it's electrons to Zn2+.