Question

K[Cu(CN)2]; +2

In which complex ion does the metal possess a d5 configuration?

1 point

[Fe(CN)6]3–

[CoCl4]2–

[Ni(OH2)6]2+

[MnF6]2


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Answer 1

Given: $K[Cu(CN)_{2}$

To find : metal ion having five electrons in d shell

Explanation: First complex of fe is ahving d5 configuration

Answer 2

Metal possess d⁵ configuration

Explanation:

• Electronic configuration d⁵ means that the metals should have 5 electrons in its d orbitals.
• In Complex [Fe(CN)₆]³⁻, CN group is an anionic species which contribute -1 charge. so metal Fe is in +3 state. So, the valance shell electronic configuration of Fe⁺³ is d⁵.
• In complex [CoCl₄]²⁻, Cl group contributes -1 charge and hence, metal Co is in +2 state . Therefore, the outershell electronic configuration of Co⁺² is d⁷.
• In complex [Ni(OH₂)₆]²⁺, here H₂O is a neutral group. So, the metal Ni is in +2 state which means its outermost shell configuration is d⁸.
• In complex [MnF₆]²⁻, F is a anionic group which contribute -1 charge. So, the outermost shell configuration of metal Mn is d³.

Therefore, metal Fe in complex [Fe(CN)₆]³⁻ possess d⁵ configuration.