Question

Which of the following mixture does not show positive deviation from Raoult’s law? * (a) Acetone-chloroform (b) Benzene-Acetone (c) Benzene-Ethanol (d) Benzene-carbon tetrachloride​

Answer 1

Answer:

The answer is Benzene-chloroform

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Answer 2

Acetone-chloroform -chloroform mixture does not show positive deviation from Raoult’s law.

Explanation:

• Acetone-chloroform does not show a positive deviation from Raoult's law. It does not show positive deviation. Instead, it shows a negative deviation.
• The presence of strong Vander wall force of attraction between acetone and chloroform leads to decrement in vapor pressure which implies -ve deviation from Raoult’s law.
• It will show negative deviation because of the formation of hydrogen bond with acetone molecule by chloroform molecule.
• A decrease in molecules of component will lead to escape due to decrease in vapour pressure.
• Thus the solution will show negative deviation.