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Which one of the following aqueous solutions will have the lowest freezing point ? A 0 . 1 molal solution of urea B 0 . 1 molal solution of sucrose C 0 . 1 molal solution of sodium chloride D 0 . 1 molal solution of calcium chloride

Which one of the following aqueous solutions will have the lowest freezing point ?

A

0.1 molal solution of urea

B

0.1 molal solution of sucrose

C

0.1 molal solution of sodium chloride

D

0.1 molal solution of calcium chloride

 

Grade:12th pass

1 Answers

ankit singh
askIITians Faculty 614 Points
3 years ago
Depression in freezing point is a colligative property which depends upon the amount of the solute.
ΔT 
f
​
 =i×k 
f
​
 ×m
 
where T 
f
​
  is the change in freezing point, i is Vant Hoff factor, m is molality and k is freezing point constant. 
 
1% glucose will have Vant Hoff factor 1, 1% sucrose will have Vant Hoff factor 1. 
 
Also, 1% NaCl will have Van't Hoff factor 2 and 1 % CaCl 
2
​
  will have Vant Hoff factor i as 3.
 
Thus 1% CaCl 
2
​
  produces most ions and thus lowers the freezing point to the maximum value.
The correct option is D.

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