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AMU Medical AMU Solved Paper-2001

  • question_answer
    An element having electronic configuration \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}}3{{p}^{1}}\] will form

    A)  neutral oxide   

    B)  acidic oxide

    C)  basic oxide                        

    D)  amphoteric oxide

    Correct Answer: D

    Solution :

                     An element having electronic configuration\[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{1}}\]. Therefore, number of electrons present in this element are 13 and its atomic number is also 13. Hence, it is aluminium and it will form amphoteric oxide. Oxide of aluminium shows amphoteric nature, ie, it reacts with both acid and alkali. \[\underset{\begin{smallmatrix}  aluminium \\  oxide \end{smallmatrix}}{\mathop{A{{l}_{2}}{{O}_{3}}}}\,\,\,+3{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}\underset{\begin{smallmatrix}  aluminium \\  sulphate \end{smallmatrix}}{\mathop{A{{l}_{2}}{{(S{{O}_{4}})}_{3}}}}\,\,\,+3{{H}_{2}}O\]                 \[A{{l}_{2}}{{O}_{3}}+2NaOH\xrightarrow{{}}\underset{\begin{smallmatrix}  sodium \\  meta  \\  aluminate \end{smallmatrix}}{\mathop{2NaAl{{O}_{2}}}}\,\,+{{H}_{2}}O\]


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