Given ions are : $F e^{2 +}, N i^{2 +}, C a^{2 +}, K^{+}, M g^{2 +}, N a^{+}, C u^{2 +}, Z n^{2 +}$ .
If all the given ions can form complexes then enter 1, else enter 0.

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Solution

For complex formation thier must b vacant d orbital, since sodium is a alkali metal and it does not posses vacant d orbital.
Hence all elements are not capable of forming complexes.

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{N a}^{+}, {C a}^{2 +}, {M g}^{2 +}, {A l}^{3 +}

{C a}^{2 +} < {N a}^{+} < {M g}^{2 +} < {A l}^{3 +}

C a^{2 +}

Z n^{2 +}

{N a}^{+}, {M g}^{2 +}, {A l}^{3 +}

N i^{2 +}

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