A compound in which a metal ion Mx+ (Z:25)has a spin only magnetic moment of 24BM. The oxidation state of the metal ion is

Spin only magnetic moment;μ=n(n+2)=24⇒n2+2n−24=0⇒(n+6)(n−4)=0⇒n=−6 or 4-ve value is not possibleHence, number of unpaired electrons, n - 4Electronic configuration ofM(Z=15)1s22s22p63s23p63d54s2Since, four unpaired electrons are present∴M3+=1s22s22p63s23p63d44s0∴ Oxidation state is +3 .