AIIMS2009Chemistry-Solutions
AIIMS 2009 Chemistry Colligative Properties MCQ Question
Type: MCQ-numerical-Hard-Class 12
A 0.1 molal solution of an acid is 4.5% ionized. Calculate freezing point. (molecular weight of the acid is 300). Kf = 1.86 K mol⁻¹ kg.
A
-0.199°C
B
2.00°C
C
0°C
D
-0.269°C
Correct Answer
Option D
Detailed Explanation
If acid is 4.5% ionized then α = 0.045. ΔTf = molality x Kf = 0.01 x 18.6 = 0.186
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