BHU PMT BHU PMT Solved Paper-2002

  • question_answer
    The solution of sodium meta aluminate on boiling with ammonium chloride gives a white precipitate of:

    A)  \[A{{l}_{2}}{{O}_{3}}\]

    B)  \[AlC{{l}_{3}}\]

    C)  \[Al{{(OH)}_{3}}\]

    D) \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]

    Correct Answer: C

    Solution :

                     \[\underset{Sod.\text{ }meta\text{ }alu\min ate}{\mathop{NaAl{{O}_{2}}}}\,+2{{H}_{2}}O\xrightarrow[{}]{N{{H}_{4}}Cl}NaOH\]                                                  \[\underset{\begin{smallmatrix}  Aluminium\text{ }hydroxide \\  \,\,\,\,\,\,\,\,\,\,\,white\text{ }ppt. \end{smallmatrix}}{\mathop{+Al{{(OH)}_{3}}}}\,\]


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