A) 0.1 molal solution of urea
B) 0.1 molal solution of sucrose
C) 0.1 molal solution of acetic acid
D) 0.1 molal solution of sodium chloride
E) 0.1 molal solution of calcium chloride
Correct Answer: E
Solution :
The lowest freezing point is given by the solute which has highest depression in freezing point. Depression in freezing point is a colligative property which depends upon the number of ions. Depression in freezing point\[\propto \] number of molecules or ions. In given alternatives only\[CaC{{l}_{2}}\]gives maximum number of ion (3 ions). So, it has maximum depression in freezing point. Therefore,\[0.1\text{ }m\text{ }CaC{{l}_{2}}\]solution has lowest freezing point.
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