Which of the following metal ions in their re | vedclass

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(B) The colour of a transition metal ion depends on the presence of unpaired electrons in its $d$-orbitals,which allows for $d-d$ transitions.| Metal

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$Fe^{2+}$

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(B) The colour of a transition metal ion depends on the presence of unpaired electrons in its $d$-orbitals,which allows for $d-d$ transitions.| Metal Ion | Electronic Configuration | Unpaired Electrons || :--- | :--- | :--- || $Zn^{2+}$ | $4s^0 3d^{10}$ | $0$ || $Cu^{+}$ | $4s^0 3d^{10}$ | $0$ || $Fe^{2+}$ | $4s^0 3d^6$ | $4$ || $Sc^{3+}$ | $4s^0 3d^0$ | $0$ |Since $Fe^{2+}$ has $4$ unpaired electrons,it can undergo $d-d$ transitions and thus forms coloured compounds.

Which of the following metal ions in their respective oxidation states forms a coloured compound?

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