An amphoteric oxide of a 3d transition metal 'M' dissolves in acids to give a salt containing the oxocation MO ²⁺ . The spin-only magnetic moment of the metal ion in this oxide is:

Step-by-step solution

According to NCERT, the amphoteric oxide of a 3d transition metal that dissolves in acids to give the MO ²⁺ oxocation is V ₂ O ₄ (which gives VO ²⁺ salts). In V ₂ O ₄ , the oxidation state of vanadium is +4 . The electronic configuration of neutral V atom (Z = 23) is [ Ar ] 3 d ^3 4 s ^2 . The electronic configuration of V ⁴⁺ ion is [ Ar ] 3 d ^1 . Since there is 1 unpaired electron ( n = 1 ), the spin-only magnetic moment is: = n(n+2) = 1(1+2) = 3 = 1.73 BM . Students who confuse this with V ₂ O ₅ (which gives VO