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BCECE Engineering BCECE Engineering Solved Paper-2003

  • question_answer
    \[N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}}\] and \[Si{{O}_{2}}\]have heat of formation equal to \[-416,-602,-1676\] and \[-911\,kJ\,mo{{l}^{-1}}\]respectively. The most stable oxide is:

    A) \[N{{a}_{2}}O\]                

    B)        \[MgO\]

    C) \[A{{l}_{2}}{{O}_{3}}\]                  

    D)        \[Si{{O}_{2}}\]

    Correct Answer: B

    Solution :

    Key Idea: The oxide having maximum heat of formation per oxygen atom (thus energy needed to break one \[M-O\]bond will be highest) will be most stable \[\therefore \]\[MgO\] is most stable oxide among \[N{{a}_{2}}O,\]\[N{{a}_{2}}O,Si{{O}_{2}}A{{l}_{2}}{{O}_{3}}\]and \[MgO\]


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