A) \[A{{l}_{2}}{{O}_{3}}<Si{{O}_{2}}<S{{O}_{2}}<{{P}_{2}}{{O}_{3}}\]
B) \[Si{{O}_{2}}<S{{O}_{2}}<A{{l}_{2}}{{O}_{3}}<{{P}_{2}}{{O}_{3}}\]
C) \[S{{O}_{2}}\]\[<{{P}_{2}}{{O}_{3}}\]\[<Si{{O}_{2}}\]\[<\]\[A{{l}_{2}}{{O}_{3}}\]
D) \[A{{l}_{2}}{{O}_{3}}\]\[<Si{{O}_{2}}\]\[<{{P}_{2}}{{O}_{3}}\]\[<S{{O}_{2}}\]
Correct Answer: D
Solution :
[d] With decrease in size from A1 to S the basic nature of oxide decrease and acidic nature increases. \[A{{l}_{2}}{{O}_{3}}<Si{{O}_{2}}<{{P}_{2}}{{O}_{3}}<S{{O}_{2}}\] \[A{{l}_{2}}{{O}_{3}}\]is amphoteric, \[Si{{O}_{2}}\]is slightly acidic whereas \[{{P}_{2}}{{O}_{3}}\]and \[Si{{O}_{2}}\]are the anhydrides of acids \[{{H}_{3}}P{{O}_{3}}\]and \[{{H}_{2}}S{{O}_{3}}\]
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