CBSE 2024 · Region 2 · Set 1 · Q33 · 5 marks
(i)The resistance of $\displaystyle 0.05 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$ solution is found to be $\displaystyle 100$ ohm. If the cell constant is $\displaystyle 0.0354 \mathrm{~cm}^{-1}$, calculate the molar conductivity of the acetic acid solution.(ii)State Faraday's first law of electrolysis. How much charge in Faraday is required for the reduction of $\displaystyle 1$ mol of $\displaystyle \mathrm{MnO}_{4}^{-}$to $\displaystyle \mathrm{Mn}^{2+}$ ?(i)The conductivity of $\displaystyle 0.0025 \mathrm{~mol} \mathrm{~L}^{-1}$ acetic acid is $\displaystyle 5.25 \times 10^{-5} \mathrm{~S} \mathrm{~cm}^{-1}$. Calculate its degree of dissociation if $\displaystyle \mathbf{\Lambda}_{\mathrm{m}}^{\mathrm{o}}$ for acetic acid is $\displaystyle 390 \mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1}$.(ii)Write anode, cathode and overall reaction of lead storage battery.
(i)
The resistance of $\displaystyle 0.05 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$ solution is found to be $\displaystyle 100$ ohm. If the cell constant is $\displaystyle 0.0354 \mathrm{~cm}^{-1}$, calculate the molar conductivity of the acetic acid solution.
(ii)
State Faraday's first law of electrolysis. How much charge in Faraday is required for the reduction of $\displaystyle 1$ mol of $\displaystyle \mathrm{MnO}_{4}^{-}$to $\displaystyle \mathrm{Mn}^{2+}$ ?
(i)
The conductivity of $\displaystyle 0.0025 \mathrm{~mol} \mathrm{~L}^{-1}$ acetic acid is $\displaystyle 5.25 \times 10^{-5} \mathrm{~S} \mathrm{~cm}^{-1}$. Calculate its degree of dissociation if $\displaystyle \mathbf{\Lambda}_{\mathrm{m}}^{\mathrm{o}}$ for acetic acid is $\displaystyle 390 \mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1}$.
(ii)
Write anode, cathode and overall reaction of lead storage battery.
Marking-scheme solution
(i)
\[\begin{array}{r}
K=\frac{1}{R}\left(\frac{L}{A}\right) \text { or } \\
k=G^{*} / R
\end{array}
\]
ElectrochemistryConductance of Electrolytic SolutionsApplylong_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.