Class NEET 2026 ALL Q #1970
COMPETENCY BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Consider the following statements about the solutions formed by mixing two liquids. A. An ideal solution thus formed obeys Raoult's law throughout the composition range. B. Mixture of chloroform and acetone shows negative deviation from Raoult's law. C. Mixture of aniline and phenol shows positive deviation from Raoult's law. Choose the correct option:
(A) A and C only
(B) A and B only
(C) B and C only
(D) A only
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Correct Answer: B

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Detailed Solution

Step 1: Analyze Statement A

An ideal solution is defined as one that obeys Raoult's law over the entire range of concentration. This statement is correct.

Step 2: Analyze Statement B

When chloroform ($CHCl_3$) and acetone ($CH_3COCH_3$) are mixed, hydrogen bonding is formed between the oxygen of acetone and the hydrogen of chloroform. This stronger interaction makes the escaping tendency of molecules lower than in pure components, resulting in a negative deviation from Raoult's law. This statement is correct.

Step 3: Analyze Statement C

Aniline and phenol form strong intermolecular hydrogen bonds between the amino group of aniline and the hydroxyl group of phenol. This leads to a stronger interaction than the pure components, which results in a negative deviation from Raoult's law, not a positive one. This statement is incorrect.

Step 4: Conclusion

Since statements A and B are correct, the correct option is (B).

Final Answer: B

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must apply the theoretical principles of intermolecular forces and Raoult's law to specific chemical mixtures.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of the underlying principles of solution chemistry (ideal vs non-ideal) rather than simple rote memorization of facts.
Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. It requires the student to evaluate multiple statements based on core concepts of physical chemistry, which is a standard pattern for competitive entrance examinations.

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