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  4. When copper sulphate solution is added to potassium ferrocyanide, the formula of product obtained is

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Q. When copper sulphate solution is added to potassium ferrocyanide, the formula of product obtained is

UPSEEUPSEE 2010

Solution:

Copper sulphate gives a reddish brown precipitate of $Cu _{2}\left[ Fe ( CN )_{6}\right]$, when treated with potassium ferrocyanide.

$2 CuSO _{4}+ K _{4} [ Fe ( CN )_{6}] \longrightarrow \underset{\text{reddish brown ppt.}}{Cu_2[Fe(CN)_6]} +2 K _{2} SO _{4}$