Question

Of the following four aqueous solutions, total number of those solutions whose freezing points is lower than that of 0.10 M C₂H₅OH is ______. (Integer answer)

1. 0.10 M Ba₃ (PO₄)₂
2. 0.10 M Na₂ SO₄
3. 0.10 M KCl
4. 0.10 M Li₃ PO₄ 

Options

• 0

• 1

• 2

• 4

Answer 1

Of the following four aqueous solutions, total number of those solutions whose freezing points is lower than that of 0.10 M C₂H₅OH is 4.

Explanation:

Due to the dissociative nature of all salts and their propensity to create multiple ions, 0.10 M C₂H₅OH will have a greater freezing point than other solutions. The depression in freezing point increases with increasing Van't hoff factor. As a result, the freezing point of all aqueous solutions is lower than that of non-dissociative C₂H₅OH.