JEE Main 2007 — Solutions Question with Solution
JEE Main 2007
Question
A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of at .
The vapour pressure of propyl alcohol is . If the mole fraction of ethyl alcohol is , its vapour pressure (in ) at the same temperature will be
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Let the vapour pressure of pure ethyl alcohol be ,
According to Raoult's law
$\begin{aligned}
& 290=200 \times 0.4+\mathrm{P} \times 0.6 \\
& \mathrm{P}=\frac{290-80}{0.6}=350 \mathrm{~mm} \mathrm{~Hg}
\end{aligned}$
Hence, (A) is correct.
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This is a previous-year question from JEE Main 2007, covering the Solutions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.