AIPMT PRELIMS2007Chemistry-Physical Chemistry
AIPMT PRELIMS 2007 Chemistry Colligative Properties MCQ Question
Type: MCQ-numerical-Medium-Class 12
0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If Kf for water is 1.86 K kg mol⁻¹, the lowering in freezing point of the solution is
A
0.56 K
B
1.12 K
C
-0.56 K
D
-1.12 K
Correct Answer
Option B
Detailed Explanation
The depression in freezing point is calculated using ΔTf = iKfm, where i is the van't Hoff factor, Kf is the cryoscopic constant, and m is the molality.
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