Show structures for all possible isomers of the following complexes. Where appropriate, label structures fac/mer, Λ/Δ, and/or cis/trans. Draw each isomer only once.
a. Triammineaquadichlorocobalt(III) chloride
b. ÎĽ-oxo-bis[pentaamminechromium(III)] ion
c. Potassium diaquabis(oxalato)manganate(III)