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Oxide of the metal cation which is not amphoteric |
Al3+ Cr3+ Mn2+ Zn2+ |
Mn2+ |
The answer is 3. The oxide of Mn2+ is not amphoteric. Here is a table of the amphoteric oxides:
The oxides of Al3+,Cr3+ and Zn2+ are all amphoteric. However, the oxide of Mn2+ is not amphoteric. This is because Mn2+ has a relatively low charge, which means that it does not have a strong polarizing effect on the oxygen atoms in the oxide ion. As a result, the oxide of Mn2+ is not a strong acid or base, and it does not dissolve in either acidic or basic solutions. |