COMEDK2023Evening ShiftChemistryElectrochemistryActual
When Lead Storage battery is in the process of getting charged which one of the following reactions takes place?
Options
- APbSO _ 4( ~s ) gets converted to Pb _ ( S ) and PbO _ 2( ~s )
- BSO ₃ gas gets liberated and PbO _ 2( ~s ) is formed.
- CPbO _ 2(s) is reduced.
- DPb _ ( S ) gets consumed.
Correct answer
A. PbSO _ 4( ~s ) gets converted to Pb _ ( S ) and PbO _ 2( ~s )
Step-by-step solution
In a lead storage battery, the discharge reaction is: Pb _ (s) + PbO _ 2(s) + 2 H ₂ SO _ 4(aq) 2 PbSO _ 4(s) + 2 H ₂ O _ (l) . During the charging process, the reaction is reversed by applying an external potential. The reaction becomes: 2 PbSO _ 4(s) + 2 H ₂ O _ (l) Pb _ (s) + PbO _ 2(s) + 2 H ₂ SO _ 4(aq) . In this process, PbSO _ 4(s) at the cathode is reduced to Pb _ (s) , and PbSO _ 4(s) at the anode is oxidized to PbO _ 2(s) . Thus, PbSO _ 4(s) is converted into Pb _ (s) and PbO _ 2(s) . Answer: PbSO _ 4( ~s