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Among VO2+, MnO4- and Cr2O72-, the spin-only magnetic moment value of the species with least oxidising ability is BM (Nearest integer). (Given atomic number V = 23, Mn = 25, Cr = 24)
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Oxidising ability: VO2+ < Cr2O72- < MnO4-
∵ stability of the highest oxidation state decreases from V to Mn (E : 1.00 V < 1.33 V < 1.51 V)
Least oxidising: VO2+, V(+5) = [Ar] 3d0 ⇒ n = 0
= n(n + 2) = 0 BM
Answer: 0
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