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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2005

  • question_answer
        For a cell given below: \[\underset{-}{\mathop{Ag|A{{g}^{+}}}}\,||\underset{+}{\mathop{C{{u}^{2+}}|Cu}}\,\]\[A{{g}^{+}}+{{e}^{-}}\xrightarrow[{}]{{}}Ag\]             \[E{}^\circ =x\]\[C{{u}^{2+}}+2{{e}^{-}}\xrightarrow[{}]{{}}Cu,\]                \[E{}^\circ =y\]E° cell is:

    A)  \[x+2y\]                             

    B)  \[2x+y\]

    C)  \[y-x\]                

    D)  \[y-2x\]

    Correct Answer: C

    Solution :

                    At LHS (oxidation) \[2\times (Ag\xrightarrow[{}]{{}}A{{g}^{+}}+{{e}^{-}})\]\[E_{ox}^{o}=-x\] At RHS (reduction) \[C{{u}^{2+}}+2{{e}^{-}}\xrightarrow[{}]{{}}Cu\] \[E_{red}^{o}=+y\] \[\underline{\overline{2Ag+C{{u}^{2+}}\xrightarrow[{}]{{}}Cu+2A{{g}^{+}},E_{cell}^{o}=(y-x)}}\] Note:\[E{}^\circ \]values remain constant when half-cell equation is multiplied/divided.


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