Choose the correct answer:
The metal oxide which can react with acid as well as alkali is:
(a) Silver oxide
(b) Copper (II) oxide
(c) Aluminium oxide
(d) Calcium oxide

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Solution

(c) aluminium oxide
As aluminium oxide is amphoteric in nature, it reacts with both acids and alkalis to form salt and water.
Al₂O₃ + 2NaOH → 2NaAlO₂ + H₂O
Al₂O₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂O

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