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19. Freezing point of 100 g water decreases by 0.15^° C when 1 g monobasic acid is added in water. If 60 m of N / 20 NaOH is required for the complete neutralization of 0.5 g of the same acid, then the degree of dissociation of acid will be (Kf for water = 1.86 K/molal)