TS EAMCET 9-Sep-2020 Shift 1 Solved Paper

The oxidation state of Fe is +2 in the complex. On ionisation, reaction occur as follows :
Total number of moles of equilibrium
=1−α+4α+α=1+4α
=1+4×0.5=1+2=3
Thus, the total number of possibilities for different types of A and B cations are 3.