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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Mock Test - Classification Elements Periodicity Properties

  • question_answer
    Which of the following are isoelectronic species? \[\overset{\oplus }{\mathop{C{{H}_{3}}}}\,(I),\text{ }\overset{\Theta }{\mathop{N{{H}_{2}}}}\,(II),\text{ }{{\overset{\oplus }{\mathop{NH}}\,}_{4}}(III)\,\,and\,\text{ }N{{H}_{3}}(IV)\]

    A) II, III and IV     

    B) I, II and III

    C) I, II and IV       

    D) II and I

    Correct Answer: A

    Solution :

    [a] No of electrons in \[\overset{\oplus }{\mathop{C}}\,{{H}_{3}}\](I) =6+3-1=8
    No. of electrons in \[{{\overset{\odot }{\mathop{NH}}\,}_{2}}\](II) =7+2+1=10
    No. of electrons in \[{{\overset{\oplus }{\mathop{NH}}\,}_{4}}\](III) =7+4+-1=10
    No. of electrons in \[N{{H}_{3}}\] (IV) =7+3=10
    II, III, and IV are iso-electronic
     


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