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  4. Which of the following pairs shows a negative deviation from Raoult’s law?

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Q. Which of the following pairs shows a negative deviation from Raoult’s law?

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Solution:

When acetone and chloroform are mixed, the hydrogen-bonding takes place between the two due to which escaping tendency of either of the liquid solution becomes less. $\underset{\text{Hydrogen bonding between chloroform and acetone}}{Cl- \underset{\overset{|}{C}l}{\overset{\underset{|}{C}l}{Cl}}-H - - - - - - - - O = C<^{CH_3}_{CH_3}}$