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Chemistry Question 54 – NEET-UG 2026

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Assertion A: For an ideal solution formed by mixing liquids P and Q, ΔmixH=0 and ΔmixV=0 Reason R: No interactions occur between P and Q. In the light of the above statements, choose the most appropriate answer from the options given below.

Recall the fundamental definition and characteristics of an ideal solution in terms of thermodynamic properties.

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Ninja Strategy•Direct Definition Recall

Quickly recall the definition of an ideal solution to confirm Assertion A and understand the nature of intermolecular forces to disprove Reason R.

Step 1: Evaluate Assertion A✦ Active

An ideal solution is defined as a solution that obeys Raoult's law over the entire range of concentrations and for which the enthalpy of mixing (ΔmixH) is zero and the volume of mixing (ΔmixV) is zero. Therefore, Assertion A is correct.

Step 2: Evaluate Reason R○ Expand

For an ideal solution, the intermolecular interactions between the solute-solvent (P-Q) molecules are of the same magnitude as the interactions between solute-solute (P-P) and solvent-solvent (Q-Q) molecules. It does not mean that *no* interactions occur between P and Q. If there were no interactions, the components would not mix to form a solution. Therefore, Reason R is incorrect.

💡 Teacher's Secret Hint

Remember that 'no interactions' is a strong statement and usually incorrect for forming a solution; 'similar interactions' is key for ideal solutions.

Step 3: Choose the Correct Option○ Expand

Since Assertion A is correct and Reason R is incorrect, the most appropriate option is (3) 'A is correct but R is not correct'.

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