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NEET Sample Paper NEET Sample Test Paper-71

  • question_answer
    The total number of valence electrons in 4.2 g of \[N_{3}^{-}\] ion is \[({{N}_{A}}\,is\,\,the\,\,Avogadro's\,\,number)\]

    A) \[1.6\,\,{{N}_{A}}\]                  

    B) 3.2

    C) \[2.1\,\,{{N}_{A}}\]                  

    D) 4.2

    Correct Answer: A

    Solution :

    42 g of \[N_{3}^{-}\] ions have \[16\,\,{{N}_{A}}\] valence electrons 4.2 g of \[N_{3}^{-}\] ions have \[=\,\,\frac{16\,{{N}_{A}}}{42}\,\,\times \,\,4.2 = 1.6\,\,{{N}_{A}}\]


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