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NEST2026ChemistryChemical Bonding and Molecular Structure

Species that are both isoelectronic and isostructural are:

Options

  1. AN ₂ O and NO ₂^-
  2. BNH ₂^- and BH ₄^-
  3. CNH ₄^+ and BH ₄^-
  4. DO ₃ and NO ₂^+

Correct answer

C. NH ₄^+ and BH ₄^-

Step-by-step solution

For NH ₄^+ : Total number of electrons = 7 + 4(1) - 1 = 10 Hybridization of N is sp^3 with zero lone pairs, giving a tetrahedral structure. For BH ₄^- : Total number of electrons = 5 + 4(1) + 1 = 10 Hybridization of B is sp^3 with zero lone pairs, giving a tetrahedral structure. Since both species have the same number of electrons and the same structure, they are isoelectronic and isostructural. Answer: NH ₄^+ and BH ₄^-

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