Which is not amphoteric [CPMT 1991]

1.	Which is not amphoteric [CPMT 1991]
A.	\[A{{l}^{3+}}\]
B.	\[C{{r}^{3+}}\]
C.	\[F{{e}^{3+}}\]
D.	\[Z{{n}^{2+}}\]
Answer» D. \[Z{{n}^{2+}}\]

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Which is not amphoteric [CPMT 1991]

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