Question:medium
The values of limiting ionic conductance of H\textsuperscript{+ and HCOO\textsuperscript{--} ions are respectively 347 and 53 S cm\textsuperscript{2} mol\textsuperscript{--1} at 298 K. If the molar conductance of 0.025M methanoic acid at 298 K is 40 S cm\textsuperscript{2} mol\textsuperscript{--1}, the dissociation constant of methanoic acid at 298 K is}
The values of limiting ionic conductance of H\textsuperscript{+ and HCOO\textsuperscript{--} ions are respectively 347 and 53 S cm\textsuperscript{2} mol\textsuperscript{--1} at 298 K. If the molar conductance of 0.025M methanoic acid at 298 K is 40 S cm\textsuperscript{2} mol\textsuperscript{--1}, the dissociation constant of methanoic acid at 298 K is}
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In competitive exams, if $\alpha$ is exactly 0.1, it is usually too large to ignore in the denominator ($1-\alpha$). However, if the options are spread out, the $C\alpha^2$ approximation gets you close enough to pick the right answer!
Updated On: May 6, 2026
- $1 \times 10^{-5}$
- $2 \times 10^{-5}$
- $1.5 \times 10^{-4}$
- $2.5 \times 10^{-5}$
- $2.5 \times 10^{-4}$
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The Correct Option is D
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