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Q.

The natures of the oxides CrO and CrO3, respectively

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a

basic and acidic

b

acidic and basic

c

amphoteric and basic

d

basic and amphoteric

answer is D.

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Detailed Solution

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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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