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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    The standard emf for the cell reaction \[2Cu_{(aq)}^{+}\xrightarrow{{}}Cu+Cu_{(aq)}^{2+}\] is +\[0.36V\]at 298K. The equilibrium constant for the reaction is

    A)  \[5\times {{10}^{6}}\]                    

    B)  \[1.2\times {{10}^{6}}\]

    C)  \[1.4\times {{10}^{12}}\]               

    D)  \[7.4\times {{10}^{12}}\]

    Correct Answer: B

    Solution :

        \[C{{u}^{+}}+C{{u}^{+}}\xrightarrow{{}}Cu+C{{u}^{2+}}\] \[n=1\]                         \[{{E}^{o}}cell=\frac{0.0591}{n}\,\log \,k\]                                 \[0.36=\frac{0.0591}{1}\,\log \,k\]                                 \[\log \,k=6.0914\] or        k = Antilog \[6.0914=1.2\times {{10}^{6}}\]


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