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Question
The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
(At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)
Options
[Fe(H2O)6]2+
[Co(H2O)6]2+
[Cr(H2O)6]2+
[Mn(H2O)6]2+
MCQ
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Solution
[Co(H2O)6]2+
Explanation:
The complex [Co(H2O)6]2+ exhibits the minimum paramagnetic behavior because Co2+ (d7) has 3 unpaired electrons. Other complexes have more unpaired electrons, making them more paramagnetic.
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