Which has maximum paramagnetic nature ?
(a) [Mn(H₂O)₆ ]²⁺ (b) [Cu(NH₃)₄ ]²⁺
(c) [Fe(CN)₆ ]⁴⁻ (d) [Cu(H₂O)₄ ]²⁺
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Answer:
(fe(CN6)⁴-
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[Mn(H₂O)₆ ]²⁺ has the highest paramagnetic character.
Explanation:
- Paramagnetism is a characteristic feature exhibited by some ions or complexes.
- This is exhibited by the unpaired electrons available in the particular species.
- And the paramagnetism is directly proportional to the number of unpaired electron.
- In [Mn(H₂O)₆ ]²⁺, electronic configuration of Mn2+ is [Ar] 3d5 4s2.
- H2O is a weak field chelate.
- So there are 5 unpaired electrons in this complex.
- In [Cu(NH₃)₄ ]²⁺, its a weak field chelate and the species have 1 unpaired electron.
- In [Fe(CN)₆ ]⁴⁻, the cyanide is a strong field chelate and the species have no unpaired electron.
- In [Cu(H₂O)₄ ]²⁺, water is a weak field chelate and the species have 1 unpaired electron.
- So maximum unpaired electron is seen in [Mn(H₂O)₆ ]²⁺.
- So its maximum paramagnetic.
For more information about paramagnetism,
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