Which of the following is correctly matched?

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(D) Let us analyze the magnetic properties of each complex:$1$. $[Cu(NH_3)_4]^{2+}$: $Cu^{2+}$ is $3d^9$. It has one unpaired electron,so it is parama

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$[Fe(CN)_6]^{4-}$: Diamagnetic

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(D) Let us analyze the magnetic properties of each complex:$1$. $[Cu(NH_3)_4]^{2+}$: $Cu^{2+}$ is $3d^9$. It has one unpaired electron,so it is paramagnetic.$2$. $[Ni(CN)_4]^{2-}$: $Ni^{2+}$ is $3d^8$. $CN^-$ is a strong field ligand,causing pairing. It is diamagnetic.$3$. $[MnCl_4]^{2-}$: $Mn^{2+}$ is $3d^5$. $Cl^-$ is a weak field ligand. It has five unpaired electrons,so it is paramagnetic.$4$. $[Fe(CN)_6]^{4-}$: $Fe^{2+}$ is $3d^6$. $CN^-$ is a strong field ligand,causing pairing. All electrons are paired,so it is diamagnetic.Therefore,the correct match is $[Fe(CN)_6]^{4-}$: Diamagnetic.

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