A) \[MgO\]
B) \[{{K}_{2}}O\]
C) \[A{{l}_{2}}{{O}_{3}}\]
D) \[CuO\]
Correct Answer: C
Solution :
Key Idea: Basicity of oxides decreases while moving in a period. Amphoteric oxides react both with acid and base. (i) \[MgO,\,\,{{K}_{2}}O\]and\[CaO\]are basic oxides (ii) \[A{{l}_{2}}{{O}_{3}}\]is amphoteric oxide \[A{{l}_{2}}{{O}_{3}}+6HCl\xrightarrow{{}}A{{l}_{2}}C{{l}_{6}}+3{{H}_{2}}O\] \[A{{l}_{2}}{{O}_{3}}+2NaOH\xrightarrow{{}}2NaAl{{O}_{2}}+{{H}_{2}}O\]
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