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Manipal Medical Manipal Medical Solved Paper-2011

  • question_answer
    The standard emf for the given cell reaction, \[Zn+C{{u}^{2+}}\xrightarrow[{}]{{}}Cu+Z{{n}^{2+}}\]is 1.10 V at\[25{}^\circ C\]. The emf for the cell reaction, when\[0.1\text{ }M\text{ }C{{u}^{2+}}\]and  solutions are used at \[25{}^\circ C\] is

    A)  1.10V           

    B)  \[-1.10V\]

    C)  2.20V            

    D)  \[-2.20V\]

    Correct Answer: A

    Solution :

     \[{{E}_{cell}}=E_{cell}^{o}-\frac{0.059}{2}\log \frac{[Z{{n}^{2+}}]}{[C{{u}^{2+}}]}\] \[=1.10-\frac{0.059}{2}\log \frac{0.1}{0.1}\] \[=1.10V\]


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