For a non ideal solution exhibiting positive deviation:
A. The vapour pressure is lower than that predicted by Raoult's law B. The vapour pressure is higher than that predicted by Raoult's law.
C. The interaction at the molecular level are weaker than in the pure state. D. The interaction at the molecular level are stronger than in the pure state.
E. Mixture of chloroform and acetone is a suitable example.
Choose the correct answer from the options given below:

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Attempt Online

A, D, E only

A, D only

B.C, E only

B, C only

Correct Answer

B, C only

Detailed Explanation

Non-ideal solution showing positive deviations In this case intermolecular attractive forces between the solute and solventA – B are weaker than those between the solventA – A and the solute B – B i.e PA > PoAxA PB > PoBxB ∆mixing H = +ve ∆mixing V = +ve Dissolution is endothermic so heating increases solubility. Ethanol and acetone Ethanol and water CS2 and acetone. Positive deviation from Raoult’s lawNon-ideal solution showing negative deviationsIn this case intermolecular attractive forces between the solute and solventA – B are stronger than those between the solventA – A and the solute B – B i.e PA < PoAxA PB < PoBxB ∆mixing H = -ve ∆mixing V = -ve Dissolution is exothermic so heating decreases solubility.Examples: Chloroform and acetone Nitric acid and water Phenol and aniline.