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

JEE Main 2016 Chemistry question

The pair having the same magnetic moment is: [At. No. : Cr , Mn , Fe , Co ]

(1) and
(2) and
(3) and
(4) and Correct

Answer: (4)

Solution

The spin-only moment is BM, so two species match only if they have the same number of unpaired electrons . Water is a weak-field ligand, so all the aqua complexes here are high spin. is : , BM. is : , BM.

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Question ID VK-115457