Question

On the basis of information given below mark the correct option.
Information:
On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.

• A. At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult’s law
• B. At specific composition methanol-acetone mixture forms maximum boiling azeotrope and will show positive deviation from Raoult s law
• C. At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult’s law
• D. At specific composition methanol-acetone mixture will form maximum boiling azeo trope and will show negative deviation from Raoult s law

Answer 1

Answer: (A)

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 $B - B$.