Chemistry-Raoult's Law
NEET Chemistry Raoult's Law MCQ Question
Type: MCQ-numerical-Easy-Class 12
What is the molar mass of compound AB2 if 1 g of it lowers the freezing point of benzene by 2.3 K? (Molar depression constant for benzene is 5.1 K kg mol^-1)
A
123 g/mol
B
111 g/mol
C
94 g/mol
D
105 g/mol
Correct Answer
Option A
Detailed Explanation
Using the freezing point depression formula, ΔTf = Kf * m, where m is molality. Here, m = (1 g / Molar mass) / 0.02 kg benzene. Solving gives Molar mass = 123 g/mol.
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