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What is meant by negative deviation from...

What is meant by negative deviation from Raoult's law and how is the sign of `Delta_("mix")H` related to negative deviation from Raoult's law ?

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`to` When the vapour pressure of a solution is lower than the predicted value by Raoult's law, it is called negative deviation.
`to` In case of negative deviation the inter molecular attractive forces between 1 - 1 and 2 - 2 are weaker than those between 1 - 2.
`to` It leads to decrease in vapour pressure resulting in negative deviation.
`to` The vapour pressure diagram showing negative deviation as follows.
`to` Eg. : `"HNO"_(3)` and water, HCl and water.
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What is meant by positive deviations from Raoult's law and how is the sign of Delta_("mix")H related to positive deviation from Raoult's law ?

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Knowledge Check

  • Which of the folowing show deviation from raoult's law .

    A
    `C_(2)H_(5)OH & H_(2)O`
    B
    `HNO_(3) & H_(2)O`
    C
    `CHCl_(3) & CH_(3)COCH_(3)`
    D
    `C_(6)H_(6) & C_(6)H_(5)CH_(3)`

  • Statement-1: Acetone + Carbon disulphide solution shows positive deviation from Raoult's law Statement-2 : Acetone + Aniline solution shows positive deviation from Raoult's law

    A
    Both statement-1 and statement-2- are correct
    B
    Both statement-1 and statement-2- are wrong
    C
    Statement-1 is correct and statement-2 is wrong
    D
    Statement-1 is wrong and statement-2 is correct

  • Which of the following liquid pairs shows a positive deviation from Raoults Law ?

    A
    Water - hydrochloric acid
    B
    Benzene - Methanol
    C
    Water - Nitric acid
    D
    Acetone-chloroform

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    What are the applications and limitations of Raoult's law.

    Mathematically, this from of the Raoult's can be given as: P_("total"=P_(1)^(0)X_(1)+P_(2)^(0)X_(2) . Solution which obey Raoult's law over the entire range of concentration are known as ideal solution . two types of deviation from Raoult's law, that is, positive and negative deviations are observed. Azeotrons arise due to very large deviation from Raoult's law. then which of the following are correct

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    The vapour pressure of a solvent is lowered by the presence of the non-volatile solute in the solution and this lowering of vapour pressure of the solvent is governed by Raoult's law , according to which the relative lowering of vapour pressure of the solvent over a solution is equal to the mole fraction of a non-volatile solute present in the solution. Howerver, in a case of binary liquid solution, if both the components of the solution are volatile then another from of Raoult's law is used . Mathematically, this from of the Raoult's can be given as: P_("total"=P_(1)^(0)X_(1)+P_(2)^(0)X_(2) . Solution which obey Raoult's law over the entire range of concentration are known as ideal solution . two types of deviation from Raoult's law, that is, positive and negative deviations are observed. Azeotrons arise due to very large deviation from Raoult's law . (When a plot of boiling point versus composition is plotted, then the type of grapgh that cannot be obtained is

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