MHT CET · Chemistry · Electrochemistry
Which of the following changes occurs during the discharging of lead accumulator?
- A \(\mathrm{Pb}_{(s)}\) is reduced
- B \(\mathrm{H}_2 \mathrm{SO}_4\) is consumed
- C \(\mathrm{PbSO}_4\) is consumed
- D \(\mathrm{PbO}_2\) is produced
Answer & Solution
Correct Answer
(B) \(\mathrm{H}_2 \mathrm{SO}_4\) is consumed
Step-by-step Solution
Detailed explanation
During discharge, the following reaction occurs:
\(\mathrm{Pb}_{(\mathrm{s})}+\mathrm{PbO}_{2(\mathrm{~s})}+2 \mathrm{H}_2 \mathrm{SO}_{4(\mathrm{aq})} \rightarrow 2 \mathrm{PbSO}_{4(\mathrm{~s})}\) \(+~2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l}}\)
As the cell operates to generate current, \(\mathrm{H}_2 \mathrm{SO}_4\) is consumed.
\(\mathrm{Pb}_{(\mathrm{s})}+\mathrm{PbO}_{2(\mathrm{~s})}+2 \mathrm{H}_2 \mathrm{SO}_{4(\mathrm{aq})} \rightarrow 2 \mathrm{PbSO}_{4(\mathrm{~s})}\) \(+~2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l}}\)
As the cell operates to generate current, \(\mathrm{H}_2 \mathrm{SO}_4\) is consumed.
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