Multiple choice

Which of the following are examples of amphiprotic metals?

  1. Si
    1. Zn
    2. Al
    3. Pb
    4. Na

  1. 1 and 2

  2. 1, 2 and 3

  3. 2 and 5

  4. 2, 3 and 4

  5. 3, 4 and 5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An amphiprotic species is a molecule or ion that can both accept and donate protons. A common example of an amphiprotic metal is  Zinc: In acid: ZnO + 2H+ → Zn2+ + H2O. In base: ZnO + H2O + 2OH- → [Zn(OH)4]2- Almunium: In acid : Al2O3 + 3 H2O + 6 H3O+(aq) → 2 [Al(H2O)6]3+(aq) In base: Al2O3 + 3 H2O + 2OH-(aq) → 2 [Al(OH)4]-(aq) Lead: In acid : PbO + 2 HCl → PbCl2 + H2O In base : PbO + 2 NaOH + H2O → Na2[Pb(OH)4]

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