Which of the following complex has five unpaired electrons?
A
[Mn(H2O)6]2+
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B
[Mn(CN)6]3−
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C
[CrCl3(H2O3]
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D
[Ag(NH3)2]+
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Solution
The correct option is B[Mn(H2O)6]2+ Mn2+ has d5 configuration, since H2O is weak ligand field, so it does not causes pairing of electrons and hence it has 5 unpaired electrons.