JEE Main 2022 · 28 Jul · Shift 1 · Chemistry Q88

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ChemistryInteger+4 / -1Question 88 of 90

The disproportionation of $\mathrm{MnO_4^{2-}}$ 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)

Your answer

Answer and worked solution

Official answer: 4

Disproportionation. $\mathrm{3MnO_4^{2-}+4H^+\rightarrow2MnO_4^-+MnO_2+2H_2O}$ .

B is $\mathrm{MnO_2}$ (Mn⁴⁺, $d^3$ ): $\sqrt{15}=3.87\approx4$ BM.

Answer: 4

Topics:Important compounds (KMnO4, K2Cr2O7)Magnetic properties and colour

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JEE Main 2022 · 28 Jul · Shift 1, Chemistry question 88