BHU PMT BHU PMT (Screening) Solved Paper-2011

  • question_answer
    A deliquescent white crystalline hydroxide X reacts with a nitrate Y to form another hydroxide which decomposes to give a insoluble brown layer of its oxide. X is a powerful cautery and breaks down the proteins of skin flesh to a pasty mass. X and Y are

    A) \[NaOH,AgN{{O}_{3}}\]               

    B) \[NaOH,Zn{{(N{{O}_{3}})}_{2}}\]

    C) \[NaOH,Al{{(N{{O}_{3}})}_{3}}\]              

    D) \[Ca{{(OH)}_{2}},HgN{{O}_{3}}\]

    Correct Answer: A

    Solution :

                     \[\underset{\begin{smallmatrix}  \,\,\,\,deliquescent \\  white\text{ }crystalline  \\  \,\,\,\,\,\,\,\,\,\,\,(X) \end{smallmatrix}}{\mathop{NaOH}}\,~+\text{ }\underset{(Y)}{\mathop{AgN{{O}_{3}}}}\,\xrightarrow{{}}\underset{unstable}{\mathop{AgOH}}\,+NaN{{O}_{3}}\] \[2AgOH\xrightarrow{{}}\underset{brown}{\mathop{A{{g}_{2}}O}}\,+{{H}_{2}}O\] Caustic soda (X) is a powerful cautery and breaks down the proteins of skin flesh to a pasty mass.


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