[Fe.NO.5H2O]SO4.
H2O is a Neutral ligand so it's charge will be counted as zero.Now NO is a monodentate +ve ligand which has +1 charge on it.
Since the valency of SO4 is -2 ,so the coordination entity should posses +2 charge.+1 charge is given by NO and the rest +1 should be given by Fe in order to form the complex .
hence the charge of Fe would be +1 .