Question:
Which of the following is a spin free complex?
Which of the following is a spin free complex?
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Weak field ligands like \(F^-\) produce high spin complexes.
Updated On: Apr 24, 2026
- \([Ni(CO)_4]\)
- \([Co(NH_3)_6]^{3+}\)
- \([Ni(CN)_4]^{2-}\)
- \([CoF_6]^{3-}\)
- \([Mn(CN)_6]^{3-}\)
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The Correct Option is D
Solution and Explanation
Concept:
• Strong field ligands $\rightarrow$ Low spin (paired electrons)
• Weak field ligands $\rightarrow$ High spin (spin free)
Step 1: Identify ligand strength.
• \(CO, CN^-\) $\rightarrow$ Strong field
• \(F^-\) $\rightarrow$ Weak field
Step 2: Analyze complexes.
• Strong field $\rightarrow$ low spin
• Weak field $\rightarrow$ high spin (spin free)
Step 3: Select correct complex.
\[ [CoF_6]^{3-} \text{ is high spin (spin free)} \]
• Strong field ligands $\rightarrow$ Low spin (paired electrons)
• Weak field ligands $\rightarrow$ High spin (spin free)
Step 1: Identify ligand strength.
• \(CO, CN^-\) $\rightarrow$ Strong field
• \(F^-\) $\rightarrow$ Weak field
Step 2: Analyze complexes.
• Strong field $\rightarrow$ low spin
• Weak field $\rightarrow$ high spin (spin free)
Step 3: Select correct complex.
\[ [CoF_6]^{3-} \text{ is high spin (spin free)} \]
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