O Levels Chemistry (5070)•5070/12/M/J/18
Explanation
Lead(II) oxide reacts with both acids and bases
Steps:
- PbO neutralizes dilute HNO3, acting as a base: PbO + 2HNO3 → Pb(NO3)2 + H2O.
- PbO neutralizes NaOH, acting as an acid: PbO + 2NaOH + H2O → Na2[Pb(OH)4].
- Oxides that react with both acids and bases exhibit amphoteric behavior.
- Therefore, PbO is classified as amphoteric.
Why C is correct:
- Amphoteric substances react with both acids and bases, as defined by their ability to act as either an acid or a base depending on the reactant.
Why the others are wrong:
- A. Acidic: Would react only with bases, not acids.
- B. Alkaline: Synonym for basic; would react only with acids, not bases.
- D. Basic: Would react only with acids, not bases.
Final answer: C
Topic: Oxides
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