2. Solved Papers
  3. CET Karnataka Engineering

CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2004

  • question_answer
    Aluminium displaces hydrogen from dilute \[HCl\] whereas silver does not. The e.m.f. of a cell prepared by combining \[Al/A{{l}^{3+}}\] and \[Ag/A{{g}^{+}}\] is 2.46V. The reduction potential of silver electrode is + 0.80 V. The reduction potential of aluminium electrode is :

    A)  + 1.66 V                              

    B)  -3.26 V

    C)  3.26 V                                  

    D)  -1.66 V

    Correct Answer: D

    Solution :

    \[{{E}^{o}}_{cell}={{E}^{o}}_{cathode}-{{E}^{o}}_{anode}\] \[\therefore \]                  \[2.46=(+0.80)-{{E}^{o}}_{A{{l}^{3+}}/Al}\] or            \[{{E}^{o}}_{A{{l}^{3+}}/Al}=0.80-2.46=-1.66\,\,V\]


You need to login to perform this action.
You will be redirected in 3 sec spinner