When 20 g of naphthoic acid (C_ 11 H_8O_2) is dissolved in 50 g of benzene (K_f = 1.72 K kg mol⁻¹), a freezing point depression of 2 K is observed. The van't Hoff factor (i) is

JEE Advanced 2007 Chemistry question

When 20 g of naphthoic acid is dissolved in 50 g of benzene ( = 1.72 K kg mol⁻¹), a freezing point depression of 2 K is observed. The van't Hoff factor (i) is

(A)0.5Correct
(B)1
(C)2
(D)3

Answer: (A)

Solution

Molar mass of = 132 + 8 + 32 = 172 g mol⁻¹. Molality mol kg⁻¹. Expected depression without association:

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Question ID VK-037433