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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2006

  • question_answer
    \[Zn\underset{C=1}{\mathop{|Z{{n}^{2+}}|}}\,\underset{C=1}{\mathop{|C{{u}^{2+}}|}}\,Cu\] If the standard reduction potential of zinc electrode and copper half-cell is \[-0.76\text{ }V\]and \[0.34\text{ }V\]respectively then the emf will be

    A)  \[1.1V\]             

    B)  \[1.4V\]

    C)  \[1.34V\]           

    D)  None of these

    Correct Answer: A

    Solution :

    Given, \[E_{Z{{n}^{2+}}/Zn}^{o}=-0.76V\] \[E_{C{{u}^{2+}}/Cu}^{o}=0.34V\] EMF       \[E_{R}^{o}-E_{L}^{o}\] \[\Rightarrow \]               \[EMF=E_{C{{u}^{2+}}/Cu}^{o}-E_{Z{{n}^{2+}}/Zn}^{o}\] \[\Rightarrow \]               \[=0.34+0.76\] \[\therefore \]  \[EMF=1.1V\]


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