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  • When a lead storage battery is discharged, then:Option: 1 SO2 is evolvedOption: 2

When a lead storage battery is discharged, then:

Option: 1

SO2 is evolved


Option: 2

lead is formed


Option: 3

lead sulphate is consumed


Option: 4

sulphuric acid is consumed


Answers (1)

The reactions occurring operation of battery are:
\text { Anode: } \mathrm{Pb}(\mathrm{s})+\mathrm{SO}_{4}^{2-}(aq)+ \mathrm{PbSO}_{4}(\mathrm{s})+2 e^-
                                                                                           
\mathrm{\text { Cathode: } P b O_{2}+ S O_{4}^{2-}+4H^{+}(aq)+2 e^- \rightarrow P b S O_{4}(s)+2 H_{2} O(l)}
                                                                                            
\begin{array}{c}{\text { Net change: } \mathrm{Pb}(\mathrm{s})+2 \mathrm{H_2SO}_{4}(aq)+\mathrm{PbO}_{2}(\mathrm{s}) \rightarrow 2 \mathrm{PbSO}_{4}(\mathrm{s})} {+\: 4 \mathrm{H}_{2} \mathrm{O}(l)}\end{array}
                                                 

Sulfuric acid is consumed.

                                              
Therefore, option(4) is correct

Posted by

Ramraj Saini

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