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A lead storage battery is discharged. During the charging of this battery, the reaction that occurs at anode, is

Options

  1. APbSO ₄( ~s )+2 e ⁻ Pb ( s )+ SO ₄²⁻( aq )
  2. BPbSO ₄( ~s )+2 H ₂ O ( I ) PbO ₂( ~s )+ SO ₄²⁻( aq )+4 H ⁺( aq )+2 e ⁻
  3. CPbSO ₄( ~s ) Pb ²⁺( aq )+ SO ₄²⁻( aq )
  4. Darray r PbSO ₄( ~s )+2 H ₂ O (l)+2 e ⁻ PbO ₂( ~s ) + SO ₄²⁻( aq )+2 H ⁺( aq ) array

Correct answer

B. PbSO ₄( ~s )+2 H ₂ O ( I ) PbO ₂( ~s )+ SO ₄²⁻( aq )+4 H ⁺( aq )+2 e ⁻

Step-by-step solution

During recharging, the cell is operated like an electrolytic cell. The electrode reactions are the reverse of those that occur during discharge. At cathod PbSO ₄(s)+2 e⁻ Pb (s)+ SO ₄²⁻( aq ) At anode PbSO ₄(s)+2 H ₂ O (l) PbO ₂(s)+ SO ₄²⁻( aq )+4 H ⁺( aq )+2 e⁻ Net reaction aligned & 2 PbSO ₄(s)+2 H ₂ O (l) & Pb (s)+ PbO ₂(s)+4 H ⁺( aq )+2 SO ₄²⁻( aq ) aligned

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