JEE Main 2007 — Ionic Equilibrium Question with Solution
JEE Main 2007
Question
The of a weak acid is . The of an aqueous buffered solution of in which of the acid is ionized is
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
For buffer solution
$\begin{aligned}
& \mathrm{pH}=\mathrm{pK}_{\mathrm{a}}+\log \frac{[\text { Salt }]}{[\text { Acid }]} \\
& =4.5+\log \frac{[\text { Salt }]}{[\text { Acid }]}
\end{aligned}$
as is ionized so =
$\begin{aligned}
& \mathrm{pH}=4.5 \\
& \mathrm{pH}+\mathrm{pOH}=14 \\
& \Rightarrow \mathrm{pOH}=14-4.5=9.5
\end{aligned}$
Hence (C) is correct.
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This is a previous-year question from JEE Main 2007, covering the Ionic Equilibrium 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.