Q.

Which is not amphoteric?

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a

Al3+

b

Cr3+

c

Fe3+

d

Zn2+

answer is C.

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Detailed Solution

Al3+,Cr3+  and  Zn2+ are amphoteric i.e  Al2O3,Cr2O3 and ZnO dissolve both in acids and alkalies.
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