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MGIMS WARDHA MGIMS WARDHA Solved Paper-2010

  • question_answer
    Calcium bums in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution. The solution on exposure to air produces a thin solid layer of B on the surface. The compounds A and B will be

    A) \[C{{a}_{3}}{{N}_{2}},N{{H}_{3}}\]           

    B) \[N{{H}_{3}},C{{O}_{2}}\]

    C) \[Ca{{(OH)}_{2}},CaC{{O}_{3}}\]               

    D) \[N{{H}_{3}},CaC{{O}_{3}}\]

    Correct Answer: D

    Solution :

                     \[A=N{{H}_{3}}\]and\[B=CaC{{O}_{3}}\] The reactions are as follows \[3Ca+{{N}_{2}}\xrightarrow{{}}~\underset{calcium\text{ }nitride}{\mathop{C{{a}_{3}}{{N}_{2}}}}\,\] \[C{{a}_{3}}{{N}_{2}}+6{{H}_{2}}O\xrightarrow{{}}3Ca{{(OH)}_{2}}+\underset{(A)}{\mathop{2N{{H}_{3}}}}\,\] \[Ca{{(OH)}_{2}}+\underset{from\,air}{\mathop{C{{O}_{2}}}}\,\xrightarrow{{}}\underset{(B)}{\mathop{CaC{{O}_{3}}}}\,+{{H}_{2}}O\] (Solid layer is due to\[CaC{{O}_{3}}\].)


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