Which of the following ions form most stable complex compound?

C u^{+ +}

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N i^{+ +}

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F e^{+ +}

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M n^{+ +}

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Solution

The correct option is C $C u^{+ +}$
Option (A) is correct.
$C u^{+ +}$ ions form most stable complex compound due to higher charge density. There is direct relationship between the charge density of metal ion and the stability of the complex.

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