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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 ?

(Atomic numbers of Cr=24,Mn=25,Fe=26,Co=27)

A
[Mn(H2O)6]2+
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B
[Fe(H2O)6]2+
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C
[Co(H2O)6]2+
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D
[Cr(H2O)6]2+
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