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Q. Which one of the following is a cationic complex?

COMEDKCOMEDK 2005Coordination Compounds

Solution:

Potassium ferrocyanide : $ K^+_4[Fe(CN)_6]^{4-}$
Sodiuin argentocyanide : $Na^+(Ag(CN)_2]^- $
Cuprarnmonium sulphate: $[Cu(NH_3)_4)^{2+}SO_4^{2-} $
Potassium mercuriciodide : $ K^+_2[HgI_4]^{2-}$