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JEE Main & Advanced JEE Main Paper (Held On 10-Jan-2019 Evening)

  • question_answer
    Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of: [JEE Main Online Paper (Held On 10-Jan-2019 Evening]

    A) ammoniated electrons

    B) sodamide

    C) sodium-ammonia complex

    D) sodium ion-ammonia complex

    Correct Answer: A

    Solution :

    \[Na+\left( x+y \right)\text{ }N{{H}_{3}}\] \[\to \,\,\underset{Ammomnium\,\,cation}{\mathop{N{{a}^{+}}{{(N{{H}_{3}})}_{x}}}}\,\,\,+\,\,\underset{Ammonium\,\,electron}{\mathop{{{e}^{-}}{{(N{{H}_{3}})}_{y}}}}\,\] Ammoniated electron is responsible for blue colour of the solution.


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