A solution having mole fraction of a solute equal to 0.05 has vapour pressure $20 \times 10 ^3 \,Nm ^{-2}.$ Hence the vapour pressure of a pure solvent is :

$21 .05 \times 10 ^3 \,Nm ^{-2}$

$2 \times 10 ^{4} \, Nm ^{-2}$

The addition of the nonvolatile solute into the pure solvent …………

decreases the freezing point of solvent

increases the vapour pressure of solvent

decreases the boiling point of solvent

decreases the freezing point of solvent

increases the freezing point of solvent

$21 .05 \times 10 ^3 \,Nm ^{-2}$

decreases the freezing point of solvent

The vapour pressure of an aqueous solution of glucose at 100 °C is 710 mm Hg. Hence the molality of the solution is

A solution having mole fraction of a solute equal to 0.05 has vapour pressure $20 \times 10 ^3 \,Nm ^{-2}.$ Hence the vapour pressure of a pure solvent is :

Which of the following aqueous solutions will have minimum elevation in boiling point ?