2020 · Q99
Which one of the following oxides shows both acidic and basic behaviour?
General KnowledgeChemistry
- AZinc oxide
- BCopper oxide
- CMagnesium oxide
- DCalcium oxide
Explanation
Zinc oxide is amphoteric: it reacts with acids to form zinc salts and with bases to form zincates such as sodium zincate. Copper(II) oxide, magnesium oxide and calcium oxide are basic oxides that react only with acids. The correct answer is zinc oxide.