(C) The reaction between copper$(II)$ ions and potassium ferrocyanide is a characteristic test for copper$(II)$ ions.$2Cu^{2+} + [Fe(CN)_6]^{4-} \to C

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(C) The reaction between copper$(II)$ ions and potassium ferrocyanide is a characteristic test for copper$(II)$ ions.$2Cu^{2+} + [Fe(CN)_6]^{4-} \to Cu_2[Fe(CN)_6]$This complex,$Cu_2[Fe(CN)_6]$,is known as copper$(II)$ hexacyanoferrate$(II)$,which forms a characteristic chocolate brown precipitate.