KCET2015ChemistryElectrochemistry
While charging the lead storage battery,
Options
- A( PbSO ₄ ) on anode is reduced to ( Pb )
- B( PbSO ₄ ) on cathode is reduced to ( Pb )
- C( PbSO ₄ ) on cathode is oxidized to ( Pb )
- D( PbSO ₄ ) on anode is oxidized to ( PbO ₂ )
Correct answer
A. ( PbSO ₄ ) on anode is reduced to ( Pb )
Step-by-step solution
Reaction occurring during charging are: At anode: ( PbSO ₄(s)+2 e⁻ Pb (s)+ SO ₄ ²⁻(a q) ) At cathode : ( PbSO ₄( ~s )+2 H ₂ O PbO ₂( ~s )+ SO ₄ ²⁻( aq )+4 H ⁺+2 e⁻ ) Net reaction: ( 2 PbSO ₄+2 H ₂ O PbO ₂+ PbO ₂+2 H ₂ SO ₄ )