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When acetic acid and K4 [Fe(CN)6 ] is added to a copper salt, a chocolate precipitate is obtained of the compound

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When acetic acid and K4 [Fe(CN)6 ] is added to a copper salt, a chocolate precipitate is obtained of the compound 

(a) Copper cyanide 

(b) Copper ferrocyanide 

(c) Basic copper sulphate

(d) Basic copper cyanide

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(b) Copper ferrocyanide

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