AIPMT PRELIMS 2011 Chemistry Colligative Properties MCQ Question
The freezing point depression constant for water is –1.86°Cm⁻¹. If 5.00 g Na₂SO₄ is dissolved in 45.0 g H₂O, the freezing point is changed by –3.82°C. Calculate the van't Hoff factor for Na₂SO₄.
0.381
2.05
2.63
3.11
Correct Answer
Detailed Explanation
Using ΔTf = i × Kf × m, the van't Hoff factor i is calculated as 2.63, indicating dissociation into ions.
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