Write the effect of dissolution of a nonvolatile solute on the freezing point of solvent

Effect of adding a non-volatie solute to a solvent is"

Solution with highest freezing point is

Calculate the freezing point of a solution of a non-volatile solute in a unknown solvent of molar mass 30g//"mole" having mole fraction of solvent equal to 0.8 . Given that latent heat of fusion of solid solvent =2.7 "kcal mol"^(-1) , freezing point of solvent =27^(@)C and R=2 "cl mol"^(-1)K^(-1) .

2 g of sugar is added to one litre of water to give sugar solution. What is the effect of addition of sugar on the boiling point and freezing point of water ?

When an aqueous solution containing a nonvolatile solute freezes,

At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is