Which of the following is not an amphoteric ion?

A l^{3 +}

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C r^{3 +}

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F e^{2 +}

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Z n^{2 +}

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Solution

The correct option is C $F e^{2 +}$
${F e}^{2 +}$ is not an amphoteric ion. because it doesn't have the ability to react both will acids and bases.
We can get ${F e}^{3 +}$ from ${F e}^{2 +}$ but can't get ${F e}^{+}$ from ${F e}^{2 +}$ .

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