Coordination CompoundHard

Question

The pair in which both species have same megnetic moment (spin only value) is :

Options

A.[Cr(H2O)6]2+, [CoCl4]2-
B.[Cr(H2O)6]2+, [Fe(H2O)6]2-
C.[Mn(H2O)6]2+, [Cr(H2O)6]2+
D.[CoCl4]2-, [Fe(H2O)6]2+

Solution

[Cr(H2O)6]2+. Here Cr is in Cr2+ form
Cr2+
Fe2+
In [Fe(H2O)]2+, Fe is in Fe2+ form. Both will have 4 unpaired electrons.

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