Raoult's Law

IMPORTANT

Raoult's Law: Overview

This topic covers concepts, such as, Raoult's Law, Raoult's Law for an Ideal Solution of Two Liquid Components, Rault's Law as a Special Case of Henry's Law & Vapour Pressure of Solutions of Solids in Liquids etc.

Important Questions on Raoult's Law

HARD
IMPORTANT

An aqueous solution is made by dissolving 10g of glucose C6H12O6 in 90g of water at 300 K. If the vapour pressure of pure water at 300 K is 32.8 mm Hg, what would be the vapour pressure of the solution?

MEDIUM
IMPORTANT

What changes occurs in the vapour pressure as a non-volatile solute is added to a pure liquid solvent?

EASY
IMPORTANT

Two liquids are mixed together to form a mixture which boils at same temperature and their boiling point is higher than the boiling point of either of them, so they show _____ from Raoult's law.

EASY
IMPORTANT

The vapour pressure of the solution is affected by adding the _____ solute.

EASY
IMPORTANT

When will the vapour pressure of the volatile liquid lowered?

HARD
IMPORTANT

The vapour pressure of water is 12.3kPa at 300 k. Now, calculate the vapour pressure of 1 molar solution of a solute in it.

MEDIUM
IMPORTANT

How we can prove that Raoult’s law as a special case of Henry’s law?

EASY
IMPORTANT

Raoult's law becomes a special case of Henry's law when KH=p0. In this equation, KH is 

EASY
IMPORTANT

Raoult's law becomes a special case of Henry's law when KH becomes equal to _____.

A. p0   B. p   C. p2

"Enter the correct answer as A, B or C."

MEDIUM
IMPORTANT

Condition at which Raoult's law becomes a special case of Henry's law?

EASY
IMPORTANT

Raoult's law becomes a special case of Henry's law when KH becomes equal to p1.

EASY
IMPORTANT

A mixture of toluene and benzene forms a nearly ideal solution. Assume PB° and PT° to be the vapor pressures of pure benzene and toluene, respectively. The slope of the line obtained by plotting the total vapor pressure to the mole fraction of benzene is:

MEDIUM
IMPORTANT

In the pressure vs. the mole fraction of benzene curves/lines shown below, the total vapour pressure of an ideal mixture of benzene and toluene will follow the curve/line.

Question Image

MEDIUM
IMPORTANT

Vapour pressure of benzene is 200 mm Hg. When 2g of non-volatile solute is dissolved in 78g benzene, benzene solution has vapour pressure 195 mm Hg. Calculate the molar mass of the solute in gmol-1( molar mass of benzene = 78gmol-1).

EASY
IMPORTANT

Raoult's law states that for a solution of volatile liquids, the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution.

HARD
IMPORTANT

_____ law which states that for a solution of volatile liquids, the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution.

HARD
IMPORTANT

The following is a graph plotted between the vapour pressure of two volatile liquids against their respective mole fractions.

Question Image

Which of the following statement is correct ?

MEDIUM
IMPORTANT

For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solution in 100 g of water, the elevation in boiling point at 1atm pressure is 2°C. Assuming the concentration of solute is much lower than the concentration of the solvent, the vapor pressure of the solution is (Kb = 0.76 K kg mol-1)

MEDIUM
IMPORTANT

Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1 mole of X and 3 mole of Y is 550 mm Hg. At the same temperature, if1  mole of Y is further added to this solution, vapour pressure of the solution increases by10 mm Hg . Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively

MEDIUM
IMPORTANT

The vapours pressure of pure components X and Y are 200 torr and 100 torr respectively. Assuming a solution of these components obeys Raoult's law, the mole fraction of component X in the vapours phase in equilibrium with a solution containing equimolecular of X and Y is