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Question

The pair having the same magnetic moment is:
[At. No.: Cr=24,Mn=25,Fe=26,Co=27]

A
[Cr(H2O)6]2+ and [Fe(H2O)6]2+
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B
[Mn(H2O)6]2+ and [Cr(H2O)6]2+
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C
[CoCl4]2 and [Fe(H2O)6]2+
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D
[Cr(H2O)6]2+ and [CoCl4]2
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Solution

The correct option is A [Cr(H2O)6]2+ and [Fe(H2O)6]2+
Cr2+d4 No of unpaired electron 4

Fe2+d6 No of unpaired electron 4

Both configurations have 4 unpaired electrons as the ligands that they are bonded to, are weak field ligands.

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