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The pair having the same magnetic moment is: (Atomic numbers: Cr= 24, Mn= 25, Fe= 26, Co= 27)

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a
CrH2O62+ and  FeH2O62+
b
MnH2O62+ and  CrH2O62+
c
CoCl42 and FeH2O62+
d
CrH2O62+ and  CoCl42

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detailed solution

Correct option is A

The central atoms in the given complexes have the following electronic configurations:

The complexes CrH2O62+ and  FeH2O62+ have the same number of unpaired electrons in the central atom, and, hence these will have the same magnetic moment.

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