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

  • question_answer The order in which the following oxides are arranged according to decreasing basic nature is [CPMT 1985]

    A) \[N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO\]

    B) \[MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O\]

    C) \[A{{l}_{2}}{{O}_{3}},\,MgO,\,CuO,\,N{{a}_{2}}O\]

    D) \[CuO,\,N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}}\]

    Correct Answer: A

    Solution :

    \[N{{a}_{2}}O,\,\,MgO,\,\,A{{l}_{2}}{{O}_{3}},\,\,CuO\]. More the metallic character higher the \[{{e}^{-}}\] donating tendency. Therefore lower the I.E. more the basic nature of oxide.

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