16.The [Mn(H2 O)6 ]2+ ion contains five unpaired electrons while [Mn(CN)6 ]4- ion contains only one unpaired electron. Explain using Crystal Field Theory.
The electronic configuration of Mn2+is 3d5 4s0. The ligand linked to the metal in the instance of hexaaquomanganese (II) ion is water, which is a weak field ligand that is unable to couple up the electrons of the 3d subshell, and the configuration is t2g3 and eg2. In the case of the hexacyano ion, the CN− is a 2 strong field ligand that causes electron pairing in the d orbitals, leaving just one unpaired electron in t2g5 eg0
