JEE Main20254 Apr 2025Evening ShiftChemistrySolutionsActual
Given below are two statements : Statement (I) : Molal depression constant K _ f is given by M₁ R T_f S_ f u s , where symbols have their usual meaning. Statement (II) : K _ f for benzene is less than the K _ f for water. In the light of the above statements, choose the most appropriate answer from the options given below :
Options
- AStatement I is incorrect but Statement II is correct
- BBoth Statement I and Statement II are incorrect
- CBoth Statement I and Statement II are correct
- DStatement I is correct but Statement II is incorrect
Correct answer
D. Statement I is correct but Statement II is incorrect
Step-by-step solution
Statement-I Molar depression constant k _f= M ₁ RT _ f ^2 H _ fus aligned & k _f= M ₁ RT _ f [ H _ fus T _ f ] & k _f= M ₁ RT _f ~S _ fus aligned Hence statement-I is correct but k _ f for benzene =5.12 ^ C molal k _ f for water =1.86 ^ C molal Hence statement- II is incorrect