JEE Main 12 Jan 2019 Shift 2 Solved Paper

Molecules of benzoic acid (C6H5COOH) dimerise in benzene. 'w' g of the acid dissolved in 30 g of benzene shows a depression in freezing point equal to 2K. If the percentage association of the acid to form dimer in the solution is 80, then w is : (Giventhat Kf = 5 K kg mol−1 , Molar mass of benzoic acid = 122 g mol−1)