Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

Molecules of benzoic acid (C6 H5 COOH) dimerise in benzene. ‘w’ g of the acid dissolved in 30 g of benzene shows a depression in freezing point equal to 2 K. If the percentage association of the acid to form dimer in the solution is 80, then w is  

(Given that Kf = 5 K kg mol–1, Molar mass of benzoic acid = 122 g mol–1) 

  1. A

    1.5 g 

  2. B

    2.4 g 

  3. C

    1.8 g 

  4. D

    1.0 g 

Solution

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