When a lead storage battery is charged:

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(C) The net cell reaction during discharge is: $Pb_{(s)} + PbO_{2_{(s)}} + 2H_2SO_{4_{(aq)}} \rightarrow 2PbSO_{4_{(s)}} + 2H_2O_{(l)}$.During dischar

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$H_2SO_4$ is regenerated

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(C) The net cell reaction during discharge is: $Pb_{(s)} + PbO_{2_{(s)}} + 2H_2SO_{4_{(aq)}} \rightarrow 2PbSO_{4_{(s)}} + 2H_2O_{(l)}$.During discharge,$H_2SO_4$ is consumed and its density decreases.The net cell reaction during recharge is the reverse of the discharge reaction: $2PbSO_{4_{(s)}} + 2H_2O_{(l)} \rightarrow Pb_{(s)} + PbO_{2_{(s)}} + 2H_2SO_{4_{(aq)}}$.Thus,during the charging process,$H_2SO_4$ is regenerated,and its concentration increases.

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