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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 42
Total: 43
The hexaaquomanganese(II) ion contains five unpaired electrons, while the hexacyano ion contains only one unpaired electron. Explain using Crystal Field Theory.
Solution:  
Mn(II) has 3d‌5electronic configuration. Water is a weak field ligandand therefore Do is small. Therefore, the hexaaqua complex will be highspin complex containing 5 unpaired electrons. On the other hand, CN‌–is a strong field ligand and therefore, Δo is large. Therefore, in its cyanocomplex, the electrons pair up and have only one unpaired electron.
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