Question

The ratio of the value of any colligative property for $KCl$ solution to that of sugar solution is:
(A) 1
(B) 0.5
(C) 2
(D) 4

Answer 1

Hint: In order to answer this question, to know the ratio of the value of any colligative property for $KCl$ solution to that of sugar solution, we should dissociate the ions of the reaction of $KCl$ . And then we will talk about the colligative property.
Step by step solution:-
An ionic compound will dissociate and covalent compounds will not dissociate.
$KCl \to {K^ + } + C{l^ - }$
Colligative property depends on the number of particles.
$KCl$ dissociates into 2 ions $(N{a^ + },C{l^ - })$ but sugar has only one whole molecule.
So the ratio of the value of any colligative property for $KCl$ solution to that for sugar solution of the same molality is nearly 2 times.
Colligative properties are those of solutions that are determined solely by the total number of soluble particles (molecules or ions) and not by the composition of the solute particles in solution. Colligative properties are also affected by temperature.

Hence, the correct option is (C).

Note:
Calculation of the properties only works perfectly for ideal solutions. In practice, this means the equations for colligative properties should only be applied to dilute real solutions when a non-volatile solute is dissolved in a volatile liquid solvent.