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JEE Main & Advanced Sample Paper JEE Main Sample Paper-42

  • question_answer
    A metal X on heating in nitrogen gas gives Y. Y on treatment with H-f) gives a colourless gas which when passed through \[CuS{{O}_{4}}\] solution gives a blue colour. Y is

    A) \[Mg{{(N{{O}_{3}})}_{2}}\]                      

    B) \[M{{g}_{3}}{{N}_{2}}\]

    C) \[N{{H}_{3}}\]                                 

    D) \[MgO\]

    Correct Answer: B

    Solution :

    \[\underset{X}{\mathop{3Mg}}\,+{{N}_{2}}\to \underset{Y}{\mathop{M{{g}_{3}}{{N}_{2}};}}\,\] \[M{{g}_{3}}{{N}_{2}}+6{{H}_{2}}O\to 3Mg{{(OH)}_{2}}\underset{colourless}{\mathop{+2N{{H}_{3}}\uparrow }}\,\] \[CuS{{O}_{4}}+4N{{H}_{3}}\xrightarrow[{}]{{}}\underset{blue\,complex}{\mathop{[Cu{{(N{{H}_{3}})}_{4}}]S{{O}_{4}}}}\,\]


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