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Components of a binarey mixture of two l...

Components of a binarey mixture of two liquids A and B were being separted by distillation. After some time separation of components stopped and composition of vapour phase vecame same as that of liquid phase. Both the components stated coming in the distillate. Explain why this happened ?

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This shows that liquids A and B on mixing form a non-ideal solution and for a particular composition, they form an azeotropic mixture.
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Components of a binary mixture of two liquids A and B were being separated by distillation. After some time separation of components stopped and composition of vapour phase became same as that of liquid phase. Both the components started coming in the distillate. Explain why this happened.

Assertion. Azeotropic mixtures are fomed only by non-ideal solutions and they may have boiling points either greater than or less than both the components. Reason. The composition of the vapour phase is same as that of liquid phase of the azeotropic mixture.

Knowledge Check

  • Two volatile and miscible liquids can be separated by fraction distillation into pure components under the conditions when :

    A
    they have low boiling points
    B
    the differences in their boilling points is large
    C
    the boliling points of the liquids are close to each other
    D
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  • Two volatile and miscible liquids can be separated by fractional distillations into pure components under the condition into pure components under the condition

    A
    They have low boiling points
    B
    The difference in boiling point is large
    C
    The boiling of two liquids are close to each other
    D
    They do not form axeotropic mixture

  • Two volatile and miscible liquids can be separated by fractional distillation into pure components under the conditions when:

    A
    they have low boiling points
    B
    the difference in their boiling points is large
    C
    the boiling points of the liquids are close to each other
    D
    they do not form azeotropic mixture

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    Two liquids (A) and (B) can be separated by the method of fractional distillation. The boiling point of liquid (A) is less than boiling point of liquid (B). Which of the liquids do you expect to come out first in the distillate ? Explain.

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    Assertion : Azeotropic mixtures are formed only by non-ideal solution and they may have boiling points either greater than both the components or lesser than both the components. Reason : The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixtures.

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