# The freezing point of urea solution is − 0.6$^{\large\circ}$C. How much urea (M.W. = 60 g $mole^{−1}$) is required to dissolve in 3 kg water ($K_f = 1.5^{\large\circ}Ckgmol^{–1}$)?

7.2 g
Hence (C) is the correct answer.