Molal depression constant for a solvent is 4.0 K kg \[mo{{l}^{-1}}.\] The depression in the freezing point of the solvent for\[0.03\text{ }mol\text{ }k{{g}^{-1}}\] solution of \[{{K}_{2}}OS{{O}_{4}}\] is: (Assume complete dissociation of the electrolyte)