Advertisements
Advertisements
प्रश्न
An azeotropic mixture of two liquids will have a boiling point lower than either of the two liquids when it ______.
विकल्प
shows a negative deviation from Raoult’s law
forms an ideal solution
shows a positive deviation from Raoult’s law
is saturated
Advertisements
उत्तर
An azeotropic mixture of two liquids will have a boiling point lower than either of the two liquids when it shows a positive deviation from Raoult’s law.
Explanation:
Intermolecular forces between solute and solvent are weaker than interactions between solute and solvent when a solution deviates from Raoult’s law. The total vapour pressure of the solution is greater than the total vapour pressure of an ideal solution. Furthermore, each component’s vapour pressure is greater than expected under Raoult’s law. As a result, the azeotropic mixture of two liquids boils at a lower temperature than either liquid alone.
APPEARS IN
संबंधित प्रश्न
In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?
Define azeotropes.
The vapour pressures of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if the total vapour pressure is 600 mm Hg. Also, find the composition of the vapour phase.
Vapour pressure of pure water at 298 K is 23.8 mm Hg. 50 g of urea (NH2CONH2) is dissolved in 850 g of water. Calculate the vapour pressure of water for this solution and its relative lowering.
Match the following:
| (i) | Colligative property | (a) | Polysaccharide |
| (ii) | Nicol prism | (b) | Osmotic pressure |
| (iii) | Activation energy | (c) | Aldol condensation |
| (iv) | Starch | (d) | Polarimeter |
| (v) | Acetaldehyde | (e) | Arrhenius equation |
State Raoult’s law for a solution containing volatile components. Write two characteristics of the solution which obey Raoult’s law at all concentrations.
Raoult’s law states that for a solution of volatile liquids the partial pressure of each component in the solution is ____________.
At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is ______.
The correct option for the value of vapour pressure of a solution at 45°C with benzene to octane in a molar ratio of 3 : 2 is
[At 45°C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]
A solution of a non-volatile solute in water freezes at −0.30°C. The vapour pressure of pure water at 298 K is 23.51 mm Hg and Kf for water is 1.86 degree/mol. The vapour pressure of rain solution at 298 K is ______ mm Hg.
