Answer
(a) $AgCl$ or $PbCl_2$ or $Hg_2Cl_2$
(b) $Zn(OH)_2$ or $ZnCO_3$ or $ZnCrO_4$
(c) $Fe(OH)_2$ or $FeCO_3$ or $FeCrO_4$
Work Step by Step
(a) According to the figue 3.10 (Section 3-5), almost all salts of $Cl^-$ are soluble, with the exception of the ones with $Ag^+$, $Pb^{2+}$ or $Hg_2^{2+}$.
(b) and (c)
According to the figure 3.10, almost all hydroxides, cromate and carbonate are insoluble. Zinc and Iron are not exceptions.
