Considering H ₂ O as a weak field ligand, the number of unpaired electrons in [ Mn ( H ₂ O )₆ ]²⁺ will be: (atomic number of Mn =25 )

Step-by-step solution

H ₂ O is a weak ligand. Thus, there will be no pairing of electron and forms high spin complex. Thus, no. of unpaired e⁻=5 Related Theory [ Mn ( H ₂ O ) ]²⁺ has octahedral geometry where the central atom are surrounded by 6 other molecules or ligands that are systematically arranged.