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, \[MgO,\Delta {{H}_{f}}=-692\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\] \[Si{{O}_{2}},\Delta {{H}_{f}}=-911\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\] \[A{{l}_{2}}{{O}_{3}},\Delta {{H}_{f}}=-1676\,\text{kJ}\,\,\text{mo}{{\text{l}}^{-1}}\] \[\therefore \]MgO is most stable oxide among given choices.You need to login to perform this action.
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