Question

van't Hoff factors of aqeuous solutions of x, y and z are 2.8, 1.8 and 3.5 respectively. Which of the following statements is correct?

• A. Boiling Point Order : $x<y<z$
• B. Freezing Point Order : $z<x<y$
• C. Osmotic Pressure Order: $x=y=z$
• D. Vapour Pressure Order : $y<x<z$

Answer 1

The correct option is B Freezing Point Order : $z<x<y$

Observed colligative property =i $\times$ normal colligative property

Depression in freezing point follows the order :
$y<x<z(T_F=T_f^0-\Delta T_f)$

$\Rightarrow$ Freezing point of the solutions follows the order : $z<x<y$