The natures of the oxides CrO and CrO₃, respectively

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basic and acidic

acidic and basic

amphoteric and basic

basic and amphoteric

answer is D.

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Detailed Solution

In CrO, the oxidation state of chromium is +2 while in Cr₂O₃ the oxidation state of chromium is +3. The oxides formed by elements in lower oxidation state are basic while those in higher oxidation state are acidic or amphoteric.

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