JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer If \[{{N}_{A}}\]is Avogadro?s number then number of valence electrons in 4.2 g of nitride ions \[({{N}^{3-}})\]

    A)                 2.4 \[{{N}_{A}}\]

    B)                 4.2 \[{{N}_{A}}\]

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

    D)                 \[3.2\,{{N}_{A}}\]

    Correct Answer: A

    Solution :

               14 gm \[{{N}^{3-}}\]ions have \[=8{{N}_{A}}\] valence electrons                                 4.2gm of \[{{N}^{3-}}\] ions have \[=\frac{8{{N}_{A}}\times 4.2}{14}=2.4{{N}_{A}}\]

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