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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

Mayank Ranka , 4 Years ago
Grade 12th pass
anser 1 Answers
ankit singh

Last Activity: 4 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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