Question:
Which of the following complexes is diamagnetic?
Which of the following complexes is diamagnetic?
Show Hint
Strong field ligands:
\[
CN^- , CO , NH_3
\]
often produce low-spin or diamagnetic complexes.
Updated On: Jun 8, 2026
- \([Fe(H_2O)_6]^{2+}\)
- \([Ni(CN)_4]^{2-}\)
- \([Mn(H_2O)_6]^{2+}\)
- \([CoF_6]^{3-}\)
Show Solution
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The Correct Option is B
Solution and Explanation
Concept:
Diamagnetic compounds contain no unpaired electrons.
CN\(^-\) is a strong field ligand and causes pairing of electrons.
Step 1: Determine oxidation state.
\[ Ni+4(-1)=-2 \] \[ Ni=+2 \] Electronic configuration: \[ 3d^8 \]
Step 2: Effect of CN\(^-\).
Strong field ligand causes pairing. Square planar geometry is formed. All electrons become paired.
Step 3: Conclusion.
The complex is diamagnetic. \[ \boxed{[Ni(CN)_4]^{2-}} \]
Step 1: Determine oxidation state.
\[ Ni+4(-1)=-2 \] \[ Ni=+2 \] Electronic configuration: \[ 3d^8 \]
Step 2: Effect of CN\(^-\).
Strong field ligand causes pairing. Square planar geometry is formed. All electrons become paired.
Step 3: Conclusion.
The complex is diamagnetic. \[ \boxed{[Ni(CN)_4]^{2-}} \]
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