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Question:

The incorrect statement out of the following is ______________. Ferric ion gives blood red colour with potassium thirocyanate. Cu2+ salts give red coloured borax bead test in reducing flame. Cu2+ ion gives chocolate coloured precipitate with potassium ferrocyanide solution. Cu2+ and Ni2+ ions give black precipitate with H2S in presence of HCl solution.

Cu2+andNi2+ions give black precipitate withH2Sin presence ofHClsolution

Ferric ion gives blood red colour with potassium thirocyanate

Cu2+salts give red coloured borax bead test in reducing flame.

Cu2+ion gives chocolate coloured precipitate with potassium ferrocyanide solution

Solution:

Cu2+ ion does not give chocolate coloured precipitate with potassium ferrocyanide solution instead it forms white precipitate. The reaction can be as follow: K4[Fe(CN)6] + 2CuSO4 → Cu2[Fe(CN)6] + 2K2SO4