JEE Main 2017 Chemistry question
The freezing point of benzene decreases by 0.45°C when 0.2 g of acetic acid is added to 20 g of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be ( for benzene = 5.12 K kg )
Answer: (B)
Solution
m = = 0.167 mol/kg, so \frac{0.45}{5.12 × 0.167}$
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