BHU PMT BHU PMT (Mains) Solved Paper-2011

  • question_answer
    Which of the following is not correct?

    A)  In Baeyer?s process bauxite is digested with\[NaOH\]solution

    B)  In Hall?s process bauxite is fused with\[N{{a}_{2}}C{{O}_{3}}\]

    C)   In Serpeck's process bauxite is mixed with coke and heated in an atmosphere of\[C{{O}_{2}}\]

    D)  Hoope's electrolytic cell is used for the purification of aluminium

    Correct Answer: C

    Solution :

    Sol.         In Serpeck's process bauxite is mixed with coke and heated to 2000 K in an atmosphere of\[{{N}_{2}}\]to give\[AlN\]. \[A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}O+{{N}_{2}}+3C\xrightarrow{{}}2AlN+3CO\]                                                                    \[+2{{H}_{2}}O\]


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