0.2 molal acid HX ionises 20%. Kf for acid is 1.86 molality–1. Freezing point is

f f T i K m. 0.02 m urea 0.02m 0.02 m NaCl 0.04 m 2 0.02 x 2 0.02 m CaCl 0.06 m (3 0.02) x The ratio of depression in the freezing point is 1 : 2 : 3