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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 26

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

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

    B)        \[N{{H}_{3}},{{H}_{2}}O,N{{H}_{4}}N{{O}_{3}}\]

    C) \[HCl,NO,N{{H}_{4}}Cl\]

    D) \[C{{O}_{2}},S{{O}_{2}},N{{a}_{2}}S{{O}_{3}}\]

    Correct Answer: B

    Solution :

    [b]: \[\underset{(A)}{\mathop{N{{H}_{4}}N{{O}_{3}}}}\,+NaOH\xrightarrow[{}]{boiling}NaN{{O}_{3}}\]\[+\underset{(B)}{\mathop{N{{H}_{3}}}}\,+{{H}_{2}}O\] \[N{{H}_{3}}\]gives brown ppt. with Nesslers reagent\[({{K}_{2}}Hg{{I}_{4}})\] \[2{{K}_{2}}[Hg{{I}_{4}}]+N{{H}_{3}}+3KOH\xrightarrow[{}]{{}}\underset{Brown\,ppt.}{\mathop{{{H}_{2}}N.HgO.HgI}}\,\]\[+7KI+{{H}_{2}}O\] [a] on heating gives \[{{N}_{2}}O\]gas [c] which rekindles a glowing splinter but is not converted into \[{{N}_{2}}O\]by air oxidation. \[\underset{(A)}{\mathop{N{{H}_{4}}N{{O}_{3}}}}\,\xrightarrow[{}]{\Delta }\underset{(C)}{\mathop{{{N}_{2}}O}}\,+2{{H}_{2}}O\]


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