For reversible operation of the lead storage cell (given in following figure) at 298 K and all species in the cell in their standard state,
 

Select the correct statement(s) based on following data.
Half cell reaction E°(volt) 
$\begin{array}{l}{\mathrm{PbO}}_2\left(\mathrm{s}\right)+{\mathrm{SO}}_4^{-2}\left(\mathrm{aq}\right)+4{\mathrm{H}}^{+}\left(\mathrm{aq}\right)2{\mathrm{e}}^{-}\to {\mathrm{PbSO}}_4\left(\mathrm{s}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\ell \right)+1.7\mathrm{V}\\ {\mathrm{PbO}}_2\left(\mathrm{s}\right)+4{\mathrm{H}}^{+}+2{\mathrm{e}}^{-}\to {\mathrm{Pb}}^{+2}\left(\mathrm{aq}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\ell \right)+1.46\mathrm{V}\\ {\mathrm{Pb}}^{+2}\left(\mathrm{aq}\right)+2{\mathrm{e}}^{-}\to \mathrm{Pb}\left(\mathrm{s}\right)-0.13\mathrm{V}\\ {\mathrm{PbSO}}_4\left(\mathrm{s}\right)+2{\mathrm{e}}^{-}\to \mathrm{Pb}\left(\mathrm{s}\right)+{\mathrm{SO}}_4^{-2}\left(\mathrm{aq}\right)\\ {\mathrm{\Delta H}}^{\circ }\text{ of the overall cell reaction }=-306\mathrm{kJ}/\mathrm{mol}\end{array}$

 

• A

  Maximum electrical work that can be extracted from the cell during discharge is 386 kJ/ mol approximately for the cell reaction

• B

  Concentration of H₂SO₄ decreases during cell discharge

• C

  During discharging  $∆\mathrm{S}$ for cell reaction is negative

• D

  Thickness of cathode & anode increases during cell discharge