JEE Main | 2018SolutionHard

Question

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point ?

Options

A.

[Co(H2O)5Cl]Cl2.H2O

B.

[Co(H2O)4Cl2]Cl.2H2O

C.

[Co(H2O)3Cl3].3H2O

D.

[Co(H2O)6]Cl3

Solution

[Co(H2O)5Cl]Cl2.H2O      i = 3
[Co(H2O)6Cl2]Cl.2H2O   i = 2
[Co(H2O)3Cl3].3H2O      i = 1
[Co(H2O)6]Cl3                i = 4
∆Tf∝i  where ∆Tf = (Tf - Tf')
Tf' = F.P. of solution
Freezing point of solution ↑ as i↓.

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