Raoult's Law

Which of the following increases with the increases in temperature in case of a liquid?

• Vapour pressure

• viscosity

• Surface Tension

• All of these

Raoults law determine

• Partial pressure of substance

• Vapour pressure of solution

• Volatility of substance

• atomic pressure of the substance

• Mole fraction of solvent

• molarity

• Normality

• Mole fraction of solute

Which pair of liquids would obey Raoult's law?

• water and hexane

• water and methanol

• benzene and ethanol

• propanone and trichloromethane

Two liquids S and T form an ideal solution. Which statement is not true?

• Liquids S and T are miscible

• The solution obeys Raoult's law

• Heat is released when S and T are mixed

• The total volume of the solution formed is the sum of the volumes of S and T used

Two miscible liquids P and Q form an ideal slution. The vapour pressure of pure P and Q at 298K are 52.0 kPa and 36.8 kPa respectively. What is the vapour pressure of a mixture containing 3 mol of P at 298K?

• 15.2 kPa

• 44.4 kPa

• 88.8 kPa

• 266.4 kPa

A and B form an ideal solution when mixed. The vapour pressure of pure A is 0.88 atm. What is the mole fraction of B in a solution where the partial vapour pressure of A is 0.52 atm?

• 0.22

• 0.41

• 0.59

• 0.65

An ideal solution contains equimolar quantities of liquids P and Q. The vapour pressure of pure P and Q at 25C are 12.5 kPa and 5.9 kPa respectively. What is the mole fraction of P in the vapour phase at equilibrium?

• 0.32

• 0.50

• 0.68

• 0.92