JEE Main & Advanced Chemistry The s-Block Elements Question Bank Alkali Metals

  • question_answer A metal M reacts with \[{{N}_{2}}\] to give a compound 'A' \[({{M}_{3}}N)\]. 'A' on heating at high temperature gives back 'M' and 'A' on reacting with \[{{H}_{2}}O\]gives a gas 'B'. 'B' turns \[CuS{{O}_{4}}\]solution blue on passing through it. A and B can be  [DCE 2003]

    A) Al and \[N{{H}_{3}}\]

    B) Li and \[N{{H}_{3}}\]

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

    D) Mg and \[N{{H}_{3}}\]

    Correct Answer: B

    Solution :

    Lithium form nitride on heating with nitrogen. Lithium nitride gives ammonia when heated with \[{{H}_{2}}O\]. Ammonia gas form tetrammine copper complex with \[CuS{{O}_{4}}\] solution. \[6Li+{{N}_{2}}\to 2L{{i}_{3}}N\] \[L{{i}_{3}}N+3{{H}_{2}}O\to 3LiOH+N{{H}_{3}}\] \[CuS{{O}_{4}}+4N{{H}_{3}}\to [Cu{{(N{{H}_{3}})}_{4}}]S{{O}_{4}}\]

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