The disproportionation of in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic momen

Question

The disproportionation of  in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment () value of B in BM is . (Nearest integer)

Canvas Classes · Accepted Answer

Disproportionation of  in acidic medium:

Oxidation states:
- : Mn = +6 (reactant)
-  (A): Mn = +7 (higher O.S.)
-  (B): Mn = +4 (lower O.S.)

Since O.S. of Mn in B < O.S. of Mn in A: B =  (Mn = +4)

Electronic configuration of :

Unpaired electrons: 3 (all three 3d electrons are unpaired by Hund's rule)

Spin-only magnetic moment:

Wait — nearest integer of 3.87 = 4. But answer key says 5.

Re-checking: If B =  with Mn in +4, , ,  BM.

However, if the question considers B =  (from a differe

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