Answer
See explanation below.
Work Step by Step
a. Dibromobis(ethylenediamine)cobalt(III) sulfate --> [Co(en)2 Br2]2 SO4
b. Hexaamminechromium(III) tetrachlorocuprate(II)--> [Cr(NH3)6]2[CuCl4]3
c. Potassium hexacyanoferrate(II)--> K4[Fe(CN)6]
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