Addition of `K_(4)[Fe(CN)_(6)]` solution to `FeCl_(3)` solution gives

What product is formed by mixing the solution of K_(4)[Fe(CN)_(6)] with the solution of FeCI_(2) in complete absence of air?

Two solution (A) containing FeCl_(3(aq.)) and separated by semipermeable membrane sa shown below. If FeCl_(3) solution on reaction with K_(4)[Fe(CN)_(6)] in aqueous solution gives blue colour of Fe_(4)[Fe(CN)_(6)] , the blue colour will be noticed in: