Solutions Question 304

Question: Which of the following liquid pairs shows a positive deviation from Raoult’s law-

Options:

A) Water - Nitric acid

B) Benzene - Methanol

C) Water-Hydrochloric acid

D) Acetone - Chloroform

Show Answer

Answer:

Correct Answer: B

Solution:

Positive deviations are shown by such solutions in which solvent-solvent and solute-solute interactions are stronger than becomes weaker. Therefore their escaping tendency increases which results in the increase in their partial vapour pressures. In pure methanol there exists intermolecular H-bonding. On adding benzene, its molecules come between methanol molecules there by breaking H-bonds which weaken intermolecular forces. This results in increase in vapour pressure.



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