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Which of the following is amphoteric?

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in Chemistry – Class 12 by (188k points)
Which of the following is amphoteric?

(a) CrO

(b) Cr2O3

(c) CrO5

(d) CrO3

I got this question by my school teacher while I was bunking the class.

Asked question is from D and F-Block Elements topic in division D and F-Block Elements of Chemistry – Class 12

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The correct option is (b) Cr2O3

Best explanation: Chromium(atomic no.24, symbol-Cr) forms many oxides. Some of its common oxidation states are +2, +3 and +6. Chromium (III) oxide (green in colour) is amphoteric, i.e., it can react as both acid and base. Its formula is Cr2O3.

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