Is $C r_{2} O_{3}$ an amphoteric oxide? If yes enter 1, else enter 0.

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Solution

Amphoteric Oxides can be either acidic or basic. They can neutralize acid or base. Chromium(III) oxide is amphoteric. Although insoluble in water, it dissolves in acid to produce hydrated chromium ions, [Cr(H₂O)₆]³⁺ which react with base to give salts of [Cr(OH)₆]³⁻.It dissolves in concentrated alkali to yield chromite ions.

The lower the oxidation state of the metal, the more ionic (basic) it will be. In case of Cr: Cr⁺²O, Cr₂ +3O₃, Cr+6O₃; the most ionic is CrO (lowest ox. state). The most covalent is CrO₃ (highest ox. state) \ CrO is basic, CrO₃ is acidic and Cr₂O₃ is amphoteric.
Hence, the correct answer is 1.

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