A) CaO
B) MgO
C) \[N{{a}_{2}}O\]
D) \[A{{l}_{2}}{{O}_{3}}\]
Correct Answer: D
Solution :
Na, Mg and Ca are highly reactive metals and their oxides are strongly basic whereas\[A{{l}_{2}}{{O}_{3}}\]is amphoteric. So among all these oxides \[A{{l}_{2}}{{O}_{3}}\]is comparatively acidic. Hence, the correct option is [d].
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