(Solved): 7 The overall reaction of lead storage battery is shown below. \\[ \\mathrm{Pb}(\\mathrm{s})+\\math ...

7 The overall reaction of lead storage battery is shown below. \\[ \\mathrm{Pb}(\\mathrm{s})+\\mathrm{PbO}_{2}(\\mathrm{~s})+2 \\mathrm{H}^{+}(\\mathrm{aq})+2 \\mathrm{HSO}_{4}^{-}(\\mathrm{aq}) \\longrightarrow 2 \\mathrm{PbSO}_{4}(\\mathrm{~s})+2 \\mathrm{H}_{2} \\mathrm{O}(\\mathrm{l}) \\] If the concentration of \\( \\mathrm{H}_{2} \\mathrm{SO}_{4} \\) is \\( 4.50 \\mathrm{~mol} \\mathrm{dm}^{-3} \\) and the \\( E_{\\text {cell }}^{\\circ} \\) is \\( 2.04 \\mathrm{~V} \\), what is the e.m.f. of the cell at \\( 25^{\\circ} \\mathrm{C} \\) ? A \\( 1.96 \\mathrm{~V} \\) B \\( \\quad 2.00 \\mathrm{~V} \\) C \\( \\quad 2.08 \\mathrm{~V} \\) D \\( 2.12 \\mathrm{~V} \\)