Question:
\([Cr(NH_3)_6]^{3+}\) is paramagnetic while \([Ni(CN)_4]^{2+}\) is diamagnetic. Explain on the basis of valence bond theory.
\([Cr(NH_3)_6]^{3+}\) is paramagnetic while \([Ni(CN)_4]^{2+}\) is diamagnetic. Explain on the basis of valence bond theory.
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Ligand strength affects electron pairing, influencing magnetic properties of complexes.
Updated On: Mar 6, 2025
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Solution and Explanation
Step 1: Electronic Configuration:
- Cr3+: 3d3, unpaired electrons → Paramagnetic
- Ni2+: 3d8, paired electrons due to strong ligand effect → Diamagnetic
Step 2: Explanation:
- NH3 is a weak field ligand, so Cr3+ retains unpaired electrons.
- CN- is a strong field ligand, causing pairing in Ni2+.
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