Ncert Exercises & Solutions

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On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

1.	At specific composition methanal-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult’s law
2.	At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show positive deviation from Raoult’s law
3.	At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult’s law
4.	At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult’s law

At specific composition methanol- acetone mixture will form minimum boiling azeotrope and will show positive deviation. This is due to weaker A—B interaction than A—A or B—B interaction. i.e., A—B < A—A and B—B

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