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  4. Which of the following oxides of Cr is amphoteric?

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Q. Which of the following oxides of $Cr$ is amphoteric?

The d-and f-Block Elements

Solution:

Acidic character of metal oxides increases with increase in oxidation number. Thus, $Cr_2O_3(Cr = +3)$ is basic, $CrO_2(Cr = +4)$ is amphoteric, $CrO_3(Cr = +6)$ is acidic. $CrO_5$ is peroxide which is also acidic.