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NEET Sample Paper NEET Sample Test Paper-12

  • question_answer
    \[Pb{{O}_{2}}\xrightarrow{{}}pbO,\Delta {{G}_{298}}<0\]\[Sn{{O}_{2}}\xrightarrow{{}}SnO,\Delta {{G}_{298}}>0\]. Most probable oxidation states of Pb and Sn will be

    A) \[P{{b}^{4+}}+S{{n}^{4+}}\]                    

    B) \[P{{b}^{4+}}+S{{n}^{2+}}\]

    C) \[P{{b}^{2+}},S{{n}^{2+}}\]                      

    D) \[P{{b}^{2+}},S{{n}^{4+}}\]

    Correct Answer: D

    Solution :

     \[\overset{+4}{\mathop{Pb}}\,{{O}_{2}}\xrightarrow{{}}\overset{+2}{\mathop{Pb}}\,O\,\Delta {{G}_{298}}<0\,\Delta {{G}_{298}}<0\] For this reaction\[\Delta G\]is negative, hence\[P{{b}^{2+}}\]is more stable than \[P{{b}^{4+}}.\] \[\overset{+4}{\mathop{Sn}}\,{{O}_{2}}\xrightarrow{{}}\overset{+2}{\mathop{Sn}}\,{{O}_{2}}\,\Delta {{G}_{298}}>0\] For this reaction\[\Delta G\]is positive, hence\[S{{n}^{4+}}\]is more stable than\[S{{n}^{2+}}\]since for spontaneous change \[\Delta G\] must be negative.


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