JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Electronegativity

  • question_answer Among \[A{{l}_{2}}{{O}_{3}},Si{{O}_{2}},{{P}_{2}}{{O}_{3}}\] and \[S{{O}_{2}}\]the correct order of acid strength is [AIEEE 2004]

    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 :

    With decrease in size from Al 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 \[S{{O}_{2}}\] are the anhydrides of acids \[{{H}_{3}}P{{O}_{3}}\] and \[{{H}_{2}}S{{O}_{3}}\].

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