JEE Main202528 Jan 2025Morning ShiftChemistrySolutionsActual
What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 ~g ~mol ⁻¹ ) and the decrease in freezing point is 0.40 K ?
Options
- A3.72 ~K ~kg ~mol ⁻¹
- B1.86 ~K ~kg ~mol ⁻¹
- C4.43 ~K ~kg ~mol ⁻¹
- D5.12 ~K ~kg ~mol ⁻¹
Correct answer
D. 5.12 ~K ~kg ~mol ⁻¹
Step-by-step solution
aligned T _ f & = K _ b m 0.4 & = K _ b 1 256 50 10⁻³ ~K _ b & =5.12 ~K ~kg / mol aligned