Question

Among \(VO ^+ _2 , MnO^-_4\) and \(Cr_2O^{2-}_7,\) the spin-only magnetic moment value of the species with least oxidising ability is ……. BM (Nearest integer).

(Given atomic member V = 23, Mn = 25, Cr = 24)

Answer 1

Correct answer is : 0

For 3d transition series ; 

Oxidising power : \(V^{=5} < Cr ^{-6} < Mn ^{+7}\)

\(V ^{+5} : [Ar] 4s^0\,3d^0\)

Number of unpaired electron = 0

\(\mu = 0\)