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JEE Main & Advanced Chemistry The p-block Elements-II / p-ब्लॉक तत्व-II Question Bank Self Evaluation Test - The p-Block Elements (Group 13 and Group 14)

  • question_answer
    In the following sets of reactants which two sets best exhibit the amphoteric characters of
    \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O~\]
    Set 1: \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\,and\,O{{H}^{-}}(aq)\]
    Set 2: \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\,and\,{{H}_{2}}O(l)\]
    Set 3: \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\,and\,{{H}^{+}}(aq)\]
    Set 4: \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O(s)\,and\,N{{H}_{3}}(aq)\]

    A) 1 and 2            

    B) 1 and 3

    C) 2 and 4            

    D) 3 and 4

    Correct Answer: B

    Solution :

    [b] Aluminium oxide is amphoteric oxide because it shows the properties of the both acidic and basic oxides. It reacts with both acids and bases to form salt and water. \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O+2NaOH\xrightarrow{{}}NaAl{{O}_{2}}+{{H}_{2}}O\] \[A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O+HCl\xrightarrow{{}}AlC{{l}_{3}}+{{H}_{2}}O\]


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