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, Raoult's Law for a Solution Containing a Non-Volatile Solute in a Liquid, Variation of Vapour Pressure of a Mixture with Composition, etc.

Important Questions on Raoult's Law

MEDIUM
IMPORTANT

Under what condition Henry's law becomes special case of Raoult's Law?

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.

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.

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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.

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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)

EASY
IMPORTANT

Which of the following units is most useful in relating concentration of solution with its vapour pressure?

EASY
IMPORTANT

When partial pressure of solvent in solution of non-volatile solute is plotted against its mole fraction, nature of graph is

EASY
IMPORTANT

Partial pressure of solvent (mole fraction=x1) in solution of non-volatile solute (mole fraction=x2) is given by equation,

HARD
IMPORTANT

Explain the determination of molar mass of a solute from relative lowering in vapour pressure.

MEDIUM
IMPORTANT

In an equilibrium at 300C with a benzene-toluene solution, the mole fraction of benzene is 0.400, then, what is the mole fraction of toluene in vapour phase?

PB0=119 torr and Pr0=37.0 torr

EASY
IMPORTANT

Maximum boiling azeotrope will be formed by-

 

HARD
IMPORTANT

Mark the correct statement(s) from the following.

HARD
IMPORTANT

Select the correct option from the following colligative effect: