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NEET CHEMISTRYSolutionsEasy

Question

The mixture that shows positive deviation from Raoult's law is:

A

Benzene + Toluene

B

Acetone + Chloroform

C

Chloroethane + Bromoethane

D

Ethanol + Acetone

Step-by-Step Solution

According to Raoult's Law:

  1. Ideal Solutions: Mixtures where solute-solute and solvent-solvent interactions are similar to solute-solvent interactions obey Raoult's law. Examples include Benzene + Toluene and Chloroethane + Bromoethane.
  2. Negative Deviation: Occurs when intermolecular attractive forces between the solute and solvent (A-B) are stronger than those in pure components. Acetone + Chloroform shows negative deviation because chloroform forms hydrogen bonds with acetone molecules.
  3. Positive Deviation: Occurs when A-B interactions are weaker than A-A and B-B interactions. In Ethanol + Acetone, pure ethanol molecules are held together by strong hydrogen bonds. Adding acetone disrupts these bonds, weakening the overall intermolecular forces and leading to a higher vapour pressure than predicted (Positive Deviation).

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Solutions. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYSolutionsmixturepositivedeviationraoults

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