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Which of the following oxide behaves as acid as well as base

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Cr₂O₃

CrO₃

CrO

CrO₅

answer is A.

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Detailed Solution

$\overset{+ 3}{{Cr}_{2}} O_{3}, \overset{+ 6}{Cr} O_{3}, \overset{+ 2}{Cr} O, \overset{+ 6}{Cr} O_{5}$

Oxidation state of oxide increases acidic nature increases, Basic nature decreases, oxides are found to be amphoteric in there intermediate oxidation state.

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