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Solutions — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistrySolutions2 Marks
Question
What role does the molecular interaction play in a solution of alcohol and water?
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Answer

The solution of alcohol and water shows positive deviation because both alcohol and water have intermolecular hydrogen bonds. But when both are mixed, the hydrogen bond formed between alcohol and water is weaker than the hydrogen bond of pure water. Therefore, for this solution $\Delta H _{\text {(mixture) }}=+ ve$ and $\Delta V _{\text {(mixture) }}=+ ve$.
The vapour pressure of the mixture will be higher and the boiling point will be lower. Therefore, this is an example of positive deviation from Raoult's law.

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