First slide

Transition elements

Question

Which is not amphoteric?

Moderate

A

${Al}^{3 +}$
B

${Cr}^{3 +}$
C

${Fe}^{3 +}$
D

${Zn}^{2 +}$

Solution

${Al}^{3 +}, {Cr}^{3 +}$ and ${Zn}^{2 +}$ are amphoteric i.e ${Al}_{2} O_{3}, {Cr}_{2} O_{3} and ZnO$
dissolve both in acids and alkalies.

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