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 `aq. 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

2

Explanation

I remains unchanged when number of ions before and after complex ion remains constant.
`{:("Solute",,y,"Complex",,y),((1)PICI_(4),,5,K_(2)[PtCI_(6)],,3),((2)ZnCl_(2),,3,Zn[(NH_(3))_(4)]Cl_(2),,3):}`