CBSE Class 12 · 2009 · All India · Redox Reactions and ElectrochemistryShort Answer

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What type of cell is the lead storage battery? Write the anode and the cathode reactions and the overall cell reaction occurring in the use of a lead storage battery.

Solution

The lead storage battery is a secondary cell — it can be recharged by passing current in the reverse direction.
During discharge:
Anode:

Pb (s) + S O_{4}^{2 -} (aq) ⟶ PbS O_{4} (s) + 2 e^{-}

Cathode:

Pb O_{2} (s) + S O_{4}^{2 -} (aq) + 4 H^{+} (aq) + 2 e^{-} ⟶ PbS O_{4} (s) + 2 H_{2} O (l)

Overall:

Pb (s) + Pb O_{2} (s) + 2 H_{2} S O_{4} (aq) ⟶ 2PbS O_{4} (s) + 2 H_{2} O (l)

CBSE Class 12 Board · 2009 · All India · Subjective

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