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AIIMS AIIMS Solved Paper-2009

  • question_answer
    The reduction potential at pH=14 for the \[[O{{H}^{-}}]=C\alpha =5\times {{10}^{-4}}\times 0.22=1.1\times {{10}^{-4}}\] couples is [Given, \[\therefore \]                                                                  \[pOH=-\log [O{{H}^{-}}]=-\log (1.1\times {{10}^{-4}})\]

    A) \[=3.96\]             

    B)        \[\therefore \] 

    C)        \[pH=14-3.96=10.04\]                   

    D)        \[{{3160}^{o}}C\]

    Correct Answer: D

    Solution :

    Given,  \[(n+l=5)\] \[\therefore \] \[n=2\]and \[l=1\] \[C<B<A<D\]  \[\therefore \]  \[D<A<B<C\] For the half-reaction, \[D<A>B<C\] \[3C+2A{{l}_{2}}{{O}_{3}}\xrightarrow{{}}4Al+3C{{O}_{2}}\] \[4A{{l}^{3+}}+12{{e}^{-}}\xrightarrow{{}}4Al\] \[\therefore \]


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