Which of the following metals reacts with both acid and hot concentrated alkalis to form hydrogen gas:
Lead (Pb)
Zinc Zn, lead Pb and aluminium Al are amphoteric in nature i.e. they react with both acids and hot concentrated alkalis to form hydrogen and soluble salt.
Example:- Zn(s) + 2NaOH(aq) + Na2ZnO2(aq) + H2(g)