A) \[MgO\]
B) \[A{{l}_{2}}{{O}_{3}}\]
C) \[Si{{O}_{2}}\]
D) cannot be predicted
Correct Answer: A
Solution :
Key Idea: Greater the amount of given out as heat of formation more will be stability of oxide. Given, \[MgO,\,\,\Delta {{H}_{f}}=692\,\,kJ\,\,mo{{l}^{-1}}\] \[Si{{O}_{2}},\,\,\Delta {{H}_{f}}=-911\,\,kJ\,\,mo{{l}^{-1}}\] \[A{{l}_{2}}{{O}_{3}},\,\,\Delta {{H}_{f}}=-1676\,\,kJ\,\,mo{{l}^{-1}}\] \[\therefore \]\[MgO\] is most stable oxide among given choices.You need to login to perform this action.
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