TS EAMCET · Chemistry · Electrochemistry
A lead storage battery is discharged. During the charging of this battery, the reaction that occurs at anode, is
- A \(\mathrm{PbSO}_4(\mathrm{~s})+2 \mathrm{e}^{-} \longrightarrow \mathrm{Pb}(\mathrm{s})+\mathrm{SO}_4^{2-}(\mathrm{aq})\)
- B \(\mathrm{PbSO}_4(\mathrm{~s})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{I}) \longrightarrow\) \(\mathrm{PbO}_2(\mathrm{~s})+\mathrm{SO}_4^{2-}(\mathrm{aq})+4 \mathrm{H}^{+}(\mathrm{aq})+2 \mathrm{e}^{-}\)
- C \(\mathrm{PbSO}_4(\mathrm{~s}) \longrightarrow \mathrm{Pb}^{2+}(\mathrm{aq})+\mathrm{SO}_4^{2-}(\mathrm{aq})\)
- D \[ \begin{array}{r} \mathrm{PbSO}_4(\mathrm{~s})+2 \mathrm{H}_2 \mathrm{O}(l)+2 \mathrm{e}^{-} \overrightarrow{\mathrm{PbO}_2(\mathrm{~s})}+\mathrm{SO}_4^{2-}(\mathrm{aq})+2 \mathrm{H}^{+}(\mathrm{aq}) \end{array} \]
Answer & Solution
Correct Answer
(B) \(\mathrm{PbSO}_4(\mathrm{~s})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{I}) \longrightarrow\) \(\mathrm{PbO}_2(\mathrm{~s})+\mathrm{SO}_4^{2-}(\mathrm{aq})+4 \mathrm{H}^{+}(\mathrm{aq})+2 \mathrm{e}^{-}\)
Step-by-step Solution
Detailed explanation
During recharging, the cell is operated like an electrolytic cell. The electrode reactions are the reverse of those that occur during discharge. At cathod \[ \mathrm{PbSO}_4(s)+2 e^{-} \longrightarrow \mathrm{Pb}(s)+\mathrm{SO}_4^{2-}(\mathrm{aq}) \] At anode…
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