Question

Which of the following metals reacts with both acid and hot concentrated alkalis to form hydrogen gas:

• A. Zinc ($Zn$)
• B. Sodium ($Na$)
• C. Lead ($Pb$)
• D. Aluminium ($Al$)

Answer 1

Answer: (A), (B), (C)

The correct options are
A

Zinc ($Zn$)

B

Sodium ($Na$)

C

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:- $Zn\left(s\right)+2NaOH\left(aq\right)+N{a}_{2}Zn{O}_2\left(aq\right)+H_2\left(g\right)$