Which from following elements in respective oxidation state develops highest spin only magnetic moment?

Step-by-step solution

The spin-only magnetic moment is determined by = n(n+2) BM, where n is the number of unpaired electrons. Electronic configurations and unpaired electron counts are analyzed for each ion. Mn ²⁺ has configuration [ Ar ] 3d^5 with n = 5 , yielding = 35 5.92 BM. Ti ³⁺ is [ Ar ] 3d^1 , n = 1 , = 3 1.73 BM. Cu ²⁺ is [ Ar ] 3d^9 , n = 1 , = 3 1.73 BM. Ni ²⁺ is [ Ar ] 3d^8 , n = 2 , = 8 2.83 BM. Mn ²⁺ exhibits the highest magnetic moment.