Answer
Please see the work below.
Work Step by Step
We can write the chemical formula of the required compounds as
a. $Pb(MnO_4)_2$ Lead(II) permanganate
b. $Ba(HCO_3)_2$ Barium hydrogen carbonate
c. $Cs_2S$ Cesium sulfide
d. $Fe(C_2H_3O_2)_2$ Iron(II) acetate