Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElectrochemistry3 Marks
Question
Write the electrode reactions and net cell reaction in $NICAD$ battery.
✓
Answer
Reactions in the cell :
(i) Oxidation at cadmium anode :
$Cd_{(s)}+2 OH^{-}(aq) \rightarrow Cd(OH)_{2(s)}+2 e^{-}$
(ii) Reduction at $NiO _{2(s)}$ cathode:
$NiO_{2(s)}+2 H_2 O_{(l)}+2 e^{-} \rightarrow Ni(OH)_{2(s)}+2 OH^{-}{ }_{(aq)}$
The overall cell reaction is the combination of above two reactions.
$Cd_{(s)}+NiO_{2(s)}+2 H_2 O_{(l)} \rightarrow Cd(OH)_{2(s)}+Ni(OH)_{2(s)}$
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