The potassium ferrocyanide solution gives Prussian blue colour,when added to :

What product is formed by mixing the solution of $K_4[Fe(CN)_6]$ with the solution of $FeCl_3$?

Identify $(A)$ to $(E)$ and also explain the reactions involved.
$CuCO_3 \to CuO$ $\xrightarrow{\text{Heat with } CuS} (A)$ $\xrightarrow{\text{conc. } HNO_3} (B)$ $\xrightarrow{NH_{3(aq)}} (C) \text{ (Blue solution)}$
$CuCO_3 \to (D)$ $\xrightarrow{Ca(OH)_2} (E) \text{ (Milky)}$ $\xrightarrow{CO_2} Ca(HCO_3)_2 \text{ (Clear solution)}$

In any ferric salt,on adding potassium ferrocyanide,a Prussian blue colour is obtained,which is:

An ammoniacal metal salt solution gives a brilliant red precipitate on the addition of dimethylglyoxime. The metal ion is:

Blood haemoglobin contains the metal