Class 12 chemistry PYQ - solution - chapter

Q7: The freezing point depression constant (K_f) of benzene is 5.12 K kg mol^-1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :     (NEET 2020)

(a) 0.40 K
(b) 0.60 K
(c) 0.20 K
(d) 0.80 K 

Ans: a

                               

                       ΔT_f = ik_fm

                       ⇒ ΔTf = 1 × 5.12 × 0.078

                      ΔT_f = 0.3993

                      ΔT_f = 0.40 K