Amphoteric oxides of Mn and Cr are:

M n O

and

C r O

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M n_{2} O_{3}

and

C r_{2} O_{3}

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M n O_{2}

and

C r_{2} O_{3}

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M n_{2} O_{7}

and

C r O_{3}

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Solution

The correct option is D $M n O_{2}$ and $C r_{2} O_{3}$
$M n O_{2}$ and $C r_{2} O_{3}$ are amphoteric.(because of intermediate oxidation state, which can be converted into higher as well as lower oxidation state)
$M n O$ is basic. $M n_{2} O_{3}$ is weakly basic. $M n_{2} O_{7}$ is strongly acidic.
$C r O$ is basic while $C r O_{3}$ is acidic.

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Similar questions

Which of the following are amphoteric oxides?

$M n_{2} O_{7}, C r O_{3}, C r_{2} O_{3}, C r O, V_{2} O_{5}, V_{2} O_{4}$

M n_{2} O_{7}, C r O_{3}, C r_{2} O_{3}, C r O, V_{2} O_{5}, V_{2} O_{4}

M n_{2} O_{7}, C r O_{3}, C r_{2} O_{3}, C r O, V_{2} O_{5}, V_{2} O_{4}

M n_{2} O_{7}, C r O_{3}, C r_{2} O_{3}, C r O, V_{2} O_{5}, V_{2} O_{4}

M n O, M n_{2} O_{3}, M n O_{2}

M n_{2} O_{7}

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