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# If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water ($\Delta T_f$), when 0.01 mole of sodium sulphate is dissolved in 1 kg of water, is ($K_f = 1.86 K kg mol^{−1}$)

0.0558K
Hence (B) is the correct answer.