Question

`PtCl_(4).6H_(2)O` can exist as a hydrated complex. `1 m` aqueous solution has the depression in freezing point of `3.72^(@)`. Assume `100%` ionization and `K_(f)(H_(2)O)=1.86^(@)mol^(-1) kg`, then the complex is
A. `[Pt(H_(2)O)_(6)]Cl_(4)`
B. `[Pt(H_(2)O)_(4)Cl_(2)]Cl_(2).2H_(2)O`
C. `[Pt(H_(2)O)_(3)Cl_(3)]Cl_(3).3H_(2)O`
D. `[Pt(H_(2)O)_(2)Cl_(4)].4H_(2)O`

Answer 1

Correct Answer - C
`DeltaT_(f)="Molality" xx K_(f) xx i`
`i=2`, hence complex is binary.
Also, CN of `Pt` is `6` and complex is hydrated.