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NEET Sample Paper NEET Sample Test Paper-35

  • question_answer
    A white crystalline solid A on boiling with caustic soda solution gave a gas B which when passed through an alkaline solution of potassium mercuric iodide gave a brown ppt. The substance  A on heating gave a gas C which rekindled a glowing splinter but did not give brown fumes with nitric oxide. The gas B and C are respectively.

    A)  \[{{H}_{2}}S,\,{{O}_{2}}\]         

    B)  \[N{{H}_{3}},{{N}_{2}}O\]

    C) \[HCl,NO\]        

    D)  \[C{{O}_{2}},{{O}_{2}}\]

    Correct Answer: B

    Solution :

    \[\underset{(A)}{\mathop{N{{H}_{4}}N{{O}_{3}}}}\,+NaOH\xrightarrow{{}}NaN{{O}_{3}}+\underset{(B)}{\mathop{N{{H}_{3}}}}\,+{{H}_{2}}O\]\[\underset{Nessler's\,\,reagent}{\mathop{2{{K}_{2}}\left[ Hg{{I}_{4}} \right]}}\,+N{{H}_{3}}+3KOH\xrightarrow{{}}\underset{Brown\,\,ppt.}{\mathop{{{H}_{2}}N.HgO.HgI}}\,+7KI+2{{H}_{2}}O\]\[N{{H}_{4}}N{{O}_{3}}\xrightarrow{{}}\underset{(C)}{\mathop{{{N}_{2}}O}}\,+2{{H}_{2}}O\] \[{{N}_{2}}O\] rekindles glowing splinter but is not converted into \[N{{O}_{2}}\] by air oxidation.


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