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  4. With K 4[ Fe ( CN )6], Cu 2+ ions gives

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Q. With $K _{4}\left[ Fe ( CN )_{6}\right], Cu ^{2+}$ ions gives

AIIMSAIIMS 2007

Solution:

With $K _{4}\left[ Fe ( CN )_{6}\right], Cu ^{2+}$ ions gives reddish brown ppt.
$2 CuSO _{4}+ K _{4}\left[ Fe ( CN )_{6}\right] \longrightarrow \underset{\text{reddish
brown ppt}}{Cu _{2}\left[ Fe ( CN )_{6}\right]} + 2K_2SO_4$