Question

Assertion (A) Ethanol and acetone show positive deviation from Raoult's law.
Reason (R) Pure ethanol molecule show hydrogen bond and on adding acetone hydrogen bond between ethanol molecules breaks.

• A. Both $A$ and $R$ are correct, $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct, $R$ is not the correct explanation of $A$.
• C. $A$ is correct, $R$ is incorrect.
• D. $A$ is incorrect, $R$ is correct.

Answer 1

Answer: (A)

Ethanol molecules shows hydrogen bonding. On adding acetone, its molecules get in between the host molecule and break some of hydrogen bonds between them. Due to weakening of interaction the mixture of ethanol and acetone shows the positive deviation from Raoult's law.