JEE Main & Advanced JEE Main Paper (Held On 09-Jan-2019 Morning)

  • question_answer
    The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of \[PbS{{O}_{4}}\] electrolyzed in g during the process is: (Molar mass of \[PbS{{O}_{4}}-=303\text{ }g\text{ }mo{{l}^{-1}}\]) [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 15.2            

    B) 7.6

    C) 11.4            

    D) 22.8

    Correct Answer: B

    Solution :

      Anodic half cell: \[P{{b}^{+2}}\,+\,2{{H}^{2}}O\,\to \,Pb{{O}_{2}}\,+\,4{{H}^{+}}+\,2{{e}^{-}}\] \[\frac{{{n}_{p{{b}^{+2}}}}}{1}\,\,=\,\,\frac{n{{e}^{-}}}{2}\] \[\frac{{{n}_{PbS{{O}_{4}}}}}{1}\,\,=\,\,\frac{0.05}{2}\] \[{{W}_{PbS{{O}_{4}}}}\,\,=\,\,\frac{0.05}{2}\,\,\times \,\,303\,\,=\,\,7.6\,\,g\]


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