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JEE Main & Advanced AIEEE Paper (Held On 11 May 2011)

  • question_answer
    In view of the signs of \[{{\Delta }_{r}}{{G}^{o}}\] for the following reactions : \[Pb{{O}_{2}}+Pb\to 2PbO,\]     \[{{\Delta }_{r}}{{G}^{o}}<0\] \[Sn{{O}_{2}}+Sn\to 2SnO,\]      \[{{\Delta }_{r}}{{G}^{o}}>0,\]which oxidation states are more characteristics for lead and tin ?     AIEEE  Solved  Paper (Held On 11 May  2011)

    A)  For lead +2, for tin +2                     

    B)  For lead +4, for tin +4

    C)  For lead +2, for tin +4                     

    D)  For lead +4, for tin +2

    Correct Answer: C

    Solution :

                                    Negative \[{{\Delta }_{r}}{{G}^{o}}\] value indicates that +2 oxidation state is more stable for \[P{{b}^{2+}}.\]Also it is supported by inert pair effect that +2 oxidation state is more stable for Pb and + 4 oxidation state is more stable for Sn.


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