JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Valency and oxidation state

  • question_answer An element X which occurs in the first short period has an outer electronic structure \[{{s}^{2}}{{p}^{1}}\]. What are the formula and acid-base character of its oxides [DCE 1999]

    A) \[X{{O}_{3}},\] basic

    B) \[{{X}_{2}}{{O}_{3}},\] basic

    C) \[{{X}_{2}}{{O}_{3}},\] amphoteric

    D) \[X{{O}_{2}},\] acidic

    Correct Answer: C

    Solution :

    \[{{B}_{2}}{{O}_{3}}\],\[A{{l}_{2}}{{O}_{3}}\]are amphoteric oxides.

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