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Solutions — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistrySolutions2 Marks
Question
State Raoult’s law for a solution containing non-volatile solute. What type of deviation from Raoult’s law is shown by a solution of chloroform and acetone and why?
✓

Answer

The relative lowering of vapour pressure of a solution is equal to the mole fraction of the solute. / The vapour pressure of a solution of a non- volatile solute is equal to the vapour pressure of the pure solvent at that temperature multiplied by its mole fraction.
Negative deviation due to formation of Hydrogen bond between chloroform and acetone.

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