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Q.

A solution of two volatile components showing negative deviation from Raoult’s Law shows

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a

decrease in vapour pressure and increase in boiling point.

b

increase in vapour pressure and decrease in boiling point

c

decrease in vapour pressure and decrease in boiling point 

d

increase in vapour pressure and increase in boiling point 

answer is A.

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Detailed Solution

For a solution showing -ve deviation solute-solvent attractive forces (A-B) stronger than solute-solute and solvent-solvent attractive force. So no. of molecules enter into vapour phase decreases. Hence vapour pressure decreases as a result boiling point increases. 

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