Answer
See explanation below.
Work Step by Step
a. Potassium tris(oxalato)chromate(III) --> K3[Cr(C2O4)3]
b. Tris(ethylenediamine)cobalt(III) pentacyanoiodomanganate(II)->[Co(en)3]4[Mn(CN)5I]3
c. Diamminediaquabromochloroaluminum nitrate--> [Al(H2O)2(NH3)2BrCl]NO3