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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2001

  • question_answer
    Aluminium displaces hydrogen from acids, but copper does not. A Galvanic cell prepared by combining \[Cu/C{{u}^{2+}}\]and \[Al/A{{l}^{3+}}\] has an emf of \[2.0V\]at 298 K. If the potential of copper electrode is \[+0.34V\], that of aluminium electrode is:

    A)  \[-2.3V\]

    B)  \[+2.34V\]

    C)  \[-1.66V\]

    D)  \[+1.66V\]

    Correct Answer: C

    Solution :

    \[\because \] \[{{E}_{RHE}}=Cu/C{{u}^{2+}}\] \[{{E}_{LHE}}=Al/A{{l}^{3+}}\] We know that \[{{E}_{cell}}={{E}_{RHE}}-{{E}_{LHE}}\] \[2=+0.34-x\] \[\therefore \] \[x=+0.34-2=-1.66V\]


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