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Which one of the following is an amphoteric oxide?

Question and options

Which one of the following is an amphoteric oxide?
  1. Na2O\mathrm{Na_2O}
  2. SO2\mathrm{SO_2}
  3. B2O3\mathrm{B_2O_3}
  4. ZnO\mathrm{ZnO}

Answer and explanation

Correct answer: D - \(\mathrm{ZnO}\)
ZnO reacts with both acids and bases (forming zinc salts and zincates), so it is amphoteric. Na2O\mathrm{Na_2O} is basic, SO2\mathrm{SO_2} and B2O3\mathrm{B_2O_3} are acidic.

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