A) A Ferric ion gives blood red colour with potassium thirocyanate
B) \[c{{u}^{2+}}\]salts give red coloured borax bead test in reducing flame.
C) \[c{{u}^{2+}}\]ion gives chocolate coloured precipitate with potassium ferrocyanide solution
D) \[C{{u}^{2+}}\]and\[N{{i}^{2+}}\] ions give black precipitate with in presence of solution
Correct Answer: C
Solution :
\[C{{u}^{2+}}\]ion does not give chocolate coloured precipitate with potassium ferrocyanide solution instead it forms white precipitate. The reaction can be as follow: \[{{K}_{4}}[Fe(C{{N}_{6}})+2CuS{{O}_{4}}\to [Fe(C{{N}_{6}})]+2{{K}_{2}}S{{O}_{4}}]\]
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