If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous
solution, the change in freezing point of water (∆T_f), when 0.01 mol of sodium sulphate is dissolved
in 1 kg of water, is (K_f = 1.86 K kg mol^–1)
JEE Main 2010 · Annual, Paper 1 · Q1955