When some amount of non-volatile solute is dissolved in a solvent to prepare a dilute solution, the vapour pressure of the solvent is lowered and it is directly proportional to the mole fraction of solvent in the solution . Relative lowering in vapour pressure is equal to mole fraction of solute .
Elevation in boiling point of solvent is a collgative property like lowering in vaour pressure of solvent in solution , `K_(b)` i.e., molal elevation constant is calculated by the formula, `K_(b)=DeltaT_(b)//` molality and also by the expression, `K_(b)=RT_(b)^(2)//1000l_(v)` where `T_(b)` is boiling point of solvent and `I_(v)` is latent heat of vapourisation for 1 gm solvent . Abnormal elevation is boiling point =iX elevation in boiling point in ideal solution where i=van't Hoff factor
Lowering in vapour pressure in an experiment was found to be x mm of Hg. It is :
Lowering in vapour pressure in an experiment was found to be x mm of Hg. It is

Options

A. Propotional to mole fraction of solvent in ideal solution
B. Equal to mole fraction of solute in ideal solution
C. Proportional to mole fraction of solute in ideal solution
D. Equal to mole fraction of solved in ideal solution

Answer

c