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BVP Medical BVP Medical Solved Paper-2013

  • question_answer
    Zinc/silver oxide cell is used in hearing acids and electric watches. The following reactions takes place \[Zn\xrightarrow{{}}Z{{n}^{2+}}+2{{e}^{-}};{{E}^{o}}=0.76V\]\[A{{g}_{2}}O+{{H}_{2}}O+2{{e}^{-}}\xrightarrow{{}}2Ag+2O{{H}^{-}};\]\[{{E}^{o}}=0.344V\]\[\Delta G\] in joules will be

    A)  \[-2.13\times {{10}^{5}}J\]

    B)  \[+2.13\times {{10}^{5}}J\]

    C)  \[-4.67\times {{10}^{7}}J\]

    D)  \[+4.67\times {{10}^{7}}J\]

    Correct Answer: A

    Solution :

                    Zinc is oxidised and \[A{{g}_{2}}O\] is reduced. \[E_{cell}^{o}=E_{A{{g}_{2}}O/Ag}^{o}(red)+E_{Zn/Z{{n}^{2+}}}^{o}(OX)\]                 \[=0.344+0.76=1.104V\] \[\Delta H=-nFE_{cell}^{o}=-2\times 96500\times 1.104J\]                                 \[=-2.13\times {{10}^{5}}J\]


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