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Which of the following is/are correct for potassium ferrocyanide?
\( \mathrm{P} \)
(a) It gives a brown precipitate with \( \mathrm{Cu}^{2+} \) ions
(b) It gives a red precipitate of mixed salt with \( \mathrm{Cd}^{2+} \)
W. ions
(c) It in excess gives a white precipitate with \( \mathrm{Zn}^{2+} \)
(d) It develps a deep red coloration with \( \mathrm{Fe}^{3+} \)
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