First slide

Colligative properties, Lowering of vapour pressure (LVP)

Question

Which one of the following solution has least freezing point ?

Easy

A

0.2 m $KCl$
B

0.2 m ${NH}_{2} - CO - {NH}_{2}$
C

0.2 m $C_{12} H_{22} O_{11}$
D

0.2 m ${CaCl}_{2}$

Solution

Depression of freezing point is a colligative property;
Greater the concentration of the solution lesser the freezing point;
$T^{0} - T \propto molality; Effective concentation in options 1, 2, 3, 4 is 0.4 M, 0.2 M, 0.2 M and 0.6 M;$

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