Question

A positive deviation form Raoult's law in solution means, the
solution has
) high boiling pointand low vapour pressure
) low boiling point and low vapour pressure
() low boiling point and high vapour pressure
high bp and high vapour pressure ​

Answer 1

Answer:

Raoult's law states that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature scaled by the mole fraction of the solvent present:

\[ P_{solution} = \chi_{solvent}P^o_{solvent} \label{RLaw} \]

Introduction

In the 1880s, French chemist François-Marie Raoult discovered that when a substance is dissolved in a solution, the vapor pressure of the solution will generally decrease. This observation depends on two variables:

the mole fraction of the amount of dissolved solute present and

the original vapor pressure (pure solvent).

At any given temperature for a particular solid or liquid, there is a pressure at which the vapor formed above the substance is in dynamic equilibrium with its liquid or solid form. This is the vapor pressure of the substance at that temperature. At equilibrium, the rate at which the solid or liquid evaporates is equal to the rate that the gas is condensing back to its original form. All solids and liquids have a vapor pressure, and this pressure is constant regardless of how much of the substance is present.

Answer 2

Answer:

low boiling point and low vapour pressure.

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