Presence of soluble impurities ______ the boiling points of liquid

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Solution

Impurities don't absorb heat. Even if they did, it would not explain anything - absorbing heat would slow down the process of getting to the boiling point, but it would not change the temperature at which liquid starts to boil. In the case of boiling point, they decrease partial pressure of water over the solution compared to Raoult's law, thus you need higher temperature for the vapor pressure to meet external pressure which is Boiling Point definition.

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The boiling point of a liquid decreases by the addition of impurities to it.

(A) Simple distillation	(i) To separate the liquids which are steam volatile, insoluble in water and contains non-volatile impurities.
(B) Fractional distillation	(ii) To separate liquids which decompose at a temperature below their normal boiling points
(C) Vacuum distillation	(iii) To separate two or more liquids which have boiling points close to each other.
(D) Steam distillation	(iv) To separate liquid from non-volatile impurities.

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