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NEET Sample Paper NEET Sample Test Paper-30

  • question_answer
    \[C{{r}_{2}}O_{7}^{2-}+{{I}^{-}}\xrightarrow{{}}{{I}_{2}}+C{{r}^{3+}}\] \[E_{cell}^{o}=0.79V,\] \[E_{C{{r}_{2}}O_{7}^{2-}}^{o}=1.33V\] \[E_{{{I}_{2}}}^{o}=?\]

    A)  \[0.54\,V\]            

    B)  \[-0.54\,V\]                 

    C)  \[0.18\,V\]                  

    D)  \[-0.18\,V\]

    Correct Answer: A

    Solution :

    In the given reaction \[{{I}^{-}}\] has been oxidized to \[{{I}_{2}}\] and \[C{{r}_{2}}O_{7}^{2-}\] has been reduced to \[C{{r}^{3+}}\]             \[_{E_{cell}^{o}}=E_{C{{r}_{2}}O_{7}^{2-}}^{o}-E_{{{I}_{2}}}^{o}\]             \[0.79=1.33-E_{{{I}_{2}}}^{o}\]             \[E_{{{I}_{2}}}^{o}=0.54\,V\]     


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