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NEETChemistryp Block Elements (Group 15, 16, 17 & 18)

Which of the following statements regarding Group 15 elements and their compounds is incorrect?

Options

  1. ABiF₅ is the only stable pentahalide of bismuth.
  2. BThe covalency of nitrogen in N₂O₅ is 5.
  3. CPH₃ has a lower boiling point than NH₃ .
  4. DSb₂O₃ is amphoteric in nature while P₂O₃ is acidic.

Correct answer

B. The covalency of nitrogen in N₂O₅ is 5.

Step-by-step solution

Statement 1 is correct: Due to the strong inert pair effect, the +5 oxidation state of bismuth is highly unstable. However, BiF₅ exists as the only stable pentahalide because of the small size and high electronegativity of fluorine. Statement 2 is incorrect: The maximum covalency of nitrogen is restricted to 4 because it lacks d-orbitals in its valence shell. In N₂O₅ , the oxidation state of nitrogen is +5, but its covalency is 4. Statement 3 is correct: NH₃ has a higher boiling point than PH₃ because ammonia molec

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