Which of the following has the maximum number of unpaired ' $d$ ' electrons?

{Z n}^{2 +}

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{F e}^{2 +}

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{N i}^{3 +}

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{C u}^{+}

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Solution

The correct option is A ${F e}^{2 +}$
$F e^{+ 2}$ has one electron paired in d-orbital. So, it has $4$ unpaired electrons which is maximum in the given ions. Hence, option B is correct.

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