Question

A solution of FeCl₃ when treated with K₄[Fe(CN)₆] gives a prussiun blue precipitate due to the formation of

(1) K[Fe₂(CN)₆]

(2) Fe[Fe(CN)₆]

(3) Fe₃[Fe(CN)₆]₂

(4) Fe₄[Fe(CN)₆]₃

Answer 1

Correct option is (4) Fe₄[Fe(CN)₆]₃

Formation of Prussian blue complex takes place.

\(4FeCl_3 + 3K_4[Fe(CN)_6] \longrightarrow \underset{\\ \text{Prussian blue precipitate}}{Fe_4 [Fe(CN)_6]_3} + 12KCl\)