Question

For `[CrCl_(3).xNH_(3)]`, elevation in `b.pt` of one molal solution is triple of one molal aqueous solution of urea. Assuming `100%` ionisation of complex molecule, calculated the value of `x`.
A. (a) `4`
B. (b) `5`
C. ( c) `6`
D. (d) None of these

Answer 1

Correct Answer - A
`DeltaT_(b) "for" CrCl_(3).xNH_(3)=DeltaT_(b)` for `"urea"xx2`, Thus complex `CrCl_(3).xNH_(3)` must furnish two ions i.e., it should be `[CrCl_(2).xNH_(3)]Cl`. Also co-ordination number of `Cr` is six, thus `x=4` and complex is `[Cr(NH_(3))_(4)Cl_(2)]Cl`.