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प्रश्न
What is meant by negative deviation from Raoult's law? Give an example. What is the sign of ∆mixH for negative deviation?
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उत्तर
The non-ideal solutions that do not obey Raoult's law over the entire range of concentration and have vapour pressures lower than those predicted by Raoult's law show a negative deviation from Raoult's law.
Example: A mixture of chloroform and acetone
In case of solutions showing negative deviations, ΔmixH has a negative sign.
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संबंधित प्रश्न
Why does a solution containing non-volatile solute have higher boiling point than the pure solvent ?
What type of deviation is shown by a mixture of ethanol and acetone? Give reason.
What type of azeotrope is formed by positive deviation from Raoult’s law?
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 ______.
On the basis of information given below mark the correct option.
(A) In bromoethane and chloroethane mixture intermolecular interactions of A–A and B–B type are nearly same as A–B type interactions.
(B) In ethanol and acetone mixture A–A or B–B type intermolecular interactions are stronger than A–B type interactions.
(C) In chloroform and acetone mixture A–A or B–B type intermolecular interactions are weaker than A–B type interactions.
Two liquids X and Y form an ideal solution. The mixture has a vapour pressure of 400 mm at 300 K when mixed in the molar ratio of 1 : 1 and a vapour pressure of 350 mm when mixed in the molar ratio of 1 : 2 at the same temperature. The vapour pressures of the two pure liquids X and Y respectively are ______.
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]
If the weight of the non-volatile solute urea (NH2–CO–NH2) is to be dissolved in 100 g of water, in order to decrease the vapour-pressure of water by 25%, then the weight of the solute will be ______ g.
An azeotropic mixture of two liquids will have a boiling point lower than either of the two liquids when it ______.
