In which case, van't Hoff factor I remains unchanged ? ( Assume common complexes of these ions)

Options

A. `PtCl_(4)` reacts with `KCl`
B. aq. `ZnCl_(2)` reacts with at. `NH_(3)`
C. aq `FeCl_(3)` reacts with aq. `K_(4)[Fe(CN)]_(6)`
D. `KMnO_(4)` reduced to `MnO_(2)` in alkaline medium `(MnO_(2)` a black `ppt`)

Answer

B

Explanation

`i` reamins unchanged when number of ions before and after complex ion remains constant. `{:("Solute",y,"Complex",y),((a)PlCI_(4),5,K_(2)[PlCI_(6)],3),((b)ZnCl_(2),3,Zn[(NH_(3))_(4)]Cl_(2),3):}`