Q.
Two solutions (A) containing $FeCl_{3}$ (aq) and (B) containing $K_{4}[Fe(CN)_{6}]$ are separated by semipermeable membrane as shown below. If $FeCl_{3}$ on reaction with $K_4 [Fe(CN)_{6}]$, produces blue colour of $Fe_{4}[Fe(CN)_{6}]$, the blue colour will be noticed in:

Solutions
Solution: