AIIMS2001Chemistry-Solutions
AIIMS 2001 Chemistry Colligative Properties MCQ Question
Type: MCQ-numerical-Hard-Class 12
Vapour pressure of benzene at 30°C is 121.8 mm. When 15 g of a non-volatile solute is dissolved in 250 g of benzene, its vapour pressure is decreased to 120.2 mm. The molecular weight of the solute is
A
35.67 g
B
356.7 g
C
432.8 g
D
502.7 g
Correct Answer
Option B
Detailed Explanation
Using Raoult's law, the decrease in vapour pressure can be used to calculate the molar mass of the solute.
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