Which of the following compounds forms white precipitate with $\mathrm{K} 4 \mathrm{Fe}(\mathrm{CN})_{6} ?$

Which of the following compounds forms white precipitate with $\mathrm{K} 4 \mathrm{Fe}(\mathrm{CN})_{6} ?$
  1. $\mathrm{Cu}^{2+}$
  2. $\mathrm{NH}_{4}^{+}$
  3. $\mathrm{Zn}^{2+}$
  4. $\mathrm{Ca}^{2+}$

Solution

$\mathrm{Zn}^{2+}$ reacts with potassium ferocyanide to form white ppt of zinc ferrocyanide.
$\mathrm{Zn}^{2+}+2 \mathrm{K}^{+}\left[\mathrm{Fe}(\mathrm{CN})_{6}ight]^{4-} ightarrow \mathrm{K}_{2} \mathrm{Ca}\left[\mathrm{Fe}(\mathrm{CN})_{6}ight] \downarrow($ white ppt. $)$ ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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