The set of amphoteric oxides among $\mathrm{ZnO}, \mathrm{Tl}_2 \mathrm{O}_3, \mathrm{In}_2 \mathrm{O}_3$,…

The set of amphoteric oxides among $\mathrm{ZnO}, \mathrm{Tl}_2 \mathrm{O}_3, \mathrm{In}_2 \mathrm{O}_3$, $\mathrm{B}_2 \mathrm{O}_3, \mathrm{PbO}, \mathrm{SnO}_2$ is
  1. $\mathrm{ZnO}, \mathrm{Tl}_2 \mathrm{O}_3, \mathrm{PbO}$
  2. $\mathrm{ZnO}, \mathrm{PbO}, \mathrm{SnO}_2$
  3. $\mathrm{ZnO}, \mathrm{In}_2 \mathrm{O}_3, \mathrm{SnO}_2$
  4. $\mathrm{ZnO}, \operatorname{In}_2 \mathrm{O}_3, \mathrm{PbO}$

Solution

Higher oxidation states of metals are acidic. Lower oxidation are basic as they produce bases reacting with water. Amphoteric oxides produce both acids and bases with water or reacts with both acid or bases. $\mathrm{Tl}_2 \mathrm{O}_3, \mathrm{In}_2 \mathrm{O}_3 \rightarrow$ basic oxides; $\mathrm{B}_2 \mathrm{O}_3 \rightarrow$ acidic oxide $\mathrm{ZnO}, \mathrm{PbO}, \mathrm{SnO}_2 \rightarrow$ acidic oxides

Asked in: AP EAMCET 2022 (06 Jul Shift 1)

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