The freezing point of 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:

1. 0.80 K
2. 0.40 K
3. 0.60 K
4. 0.20 K

What happens to the value of the molal depression constant (K_f) when the molality of a dilute solution is doubled?

1. It becomes doubled

2. It becomes halved

3. It becomes tripled

4. It remains unchanged