JEE Main & Advanced Sample Paper JEE Main Sample Paper-20

  • question_answer
    What is the EMF of represented cell at 298\[Ag|A{{g}^{+}}\] \[(aq\,0.1M)||{{H}^{+}}\] \[(aq,0.1M),\] \[{{H}_{2}}(g,\,0.1\,bar)|Pt\] Given: \[E_{Ag/A{{g}^{+}}}^{0}=-0.8V\]

    A)  \[0.77\,\,V\]                  

    B)  \[-0.829\,\,V\]

    C)  \[-0.77\,V\]                   

    D)  None of these

    Correct Answer: C

    Solution :

     Cell reaction is \[2Ag(s)+2{{H}^{+}}(aq)\to 2A{{g}^{+}}(aq)+{{H}_{2}}(g)\] \[{{E}_{cell}}=-0.80-\frac{0.0591}{2}\log \frac{{{(0.1)}^{2}}\times 0.1}{{{(0.1)}^{2}}}\] \[{{E}_{cell}}=-0.80+0.02955=-0.77V\]


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