Which of the following ion/ions is/are diamag | vedclass

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(B, D) To determine if a complex is diamagnetic, we check for the presence of unpaired electrons in the metal ion's $d$-orbitals.$1$. $[CoF_6]^{3-}$:

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

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(B, D) To determine if a complex is diamagnetic, we check for the presence of unpaired electrons in the metal ion's $d$-orbitals.$1$. $[CoF_6]^{3-}$: $Co^{3+}$ is a $d^6$ ion. $F^-$ is a weak field ligand, resulting in a high-spin complex with $4$ unpaired electrons. It is paramagnetic.$2$. $[Co(NH_3)_6]^{3+}$: $Co^{3+}$ is a $d^6$ ion. $NH_3$ is a strong field ligand, causing pairing of electrons. The configuration is $t_{2g}^6 e_g^0$, meaning $0$ unpaired electrons. It is diamagnetic.$3$. $[Fe(OH_2)_6]^{2+}$: $Fe^{2+}$ is a $d^6$ ion. $H_2O$ is a weak field ligand, resulting in a high-spin complex with $4$ unpaired electrons. It is paramagnetic.$4$. $[Fe(CN)_6]^{4-}$: $Fe^{2+}$ is a $d^6$ ion. $CN^-$ is a strong field ligand, causing pairing of electrons. The configuration is $t_{2g}^6 e_g^0$, meaning $0$ unpaired electrons. It is diamagnetic.Thus, both $[Co(NH_3)_6]^{3+}$ and $[Fe(CN)_6]^{4-}$ are diamagnetic.

Which of the following ion/ions is/are diamagnetic?

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