Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-numerical-Hard-Class 12
Given that 1 g of compound AB2 lowers the freezing point of benzene by 2.3 K and 1 g of AB4 lowers it by 1.3 K, calculate the atomic mass of element A if the atomic mass of B is 10 g/mol and the molar depression constant for benzene is 5.1 K kg mol⁻¹.
A
20 g/mol
B
30 g/mol
C
40 g/mol
D
50 g/mol
Correct Answer
Option A
Detailed Explanation
Using the formula ΔTf = Kf * m, where m is the molality, we find the molar mass of AB2 and AB4 and solve the system of equations. Given atomic mass of B = 10 g/mol, we compute atomic mass of A as 20 g/mol.
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