A) \[A{{l}_{2}}{{O}_{3}}\]
B) \[Si{{O}_{2}}\]
C) \[{{P}_{2}}{{O}_{5}}\]
D) \[MgO\]
Correct Answer: C
Solution :
Key Idea: Oxides of metals are basic but that of non metals are acidic. Acidity of oxides increases on moving from left to right in a period. \[\therefore \] Order of increasing acidic character among given oxides is \[MgO<A{{l}_{2}}{{O}_{3}}<Si{{O}_{2}}<{{P}_{2}}{{O}_{5}}\] \[\therefore \]\[{{P}_{2}}{{O}_{5}}\] is most acidic oxide.
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