Question

The disproportionation of \[\ce{MnO^{2-}_4}\] 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 (µ) value of B in BM is ______. (Nearest integer)

Options

• 6

• 4

• 7

• 9

Answer 1

The disproportionation of \[\ce{MnO^{2-}_4}\] 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 (µ) value of B in BM is 4.

Explanation:

\[\ce{MnO^{2-}_4 ->[H+] MnO^-_2 + MnO2}\]

No. of unpaired e^-(n) = 3

`therefore mu = sqrt("n"("n + 2")) = sqrt15 = 3.877` B. M. ≈ 4 B. M.