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Electrochemistry — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry3 Marks
Question
Write electrode reactions taking place in:
  1. Ni–Cd cell.
  2. Lead Acid Accumulator.
✓

Answer

  1. $\text{Cd(s)}+2\text{OH}^-(\text{aq})\xrightarrow{ \ \ \ \ \ }\text{Cd(OH)}_2(\text{s}) + 2\text{e}^-$
$\text{NiO}_2(\text{s) + 2H}_2\text{O}+2\text{e}^-\xrightarrow{ \ \ \ \ \ \ \ }\text{Ni(OH)}_2(\text{s})+2\text{OH}^-(\text{aq})$
  1. $\text{Pb}\xrightarrow{ \ \ \ \ \ \ \ }\text{Pb}^{2+}+2\text{e}^-\text{(at anode)}\text{PbO}_2^+$
$\text{SO}_4^{2-}+4\text{H}^++2\text{e}^-\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{PbSO}_4+2\text{H}_2\text{O}$ (at cathode)

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