Correct statements from the following are: A. Nitrogen in oxidation states from +1 to +4 disproportionates in acid medium. B. Nitrogen has the ability to form d - p multiple bonds with itself and other elements with small size and high electronegativity. C. N-N single bond is stronger than P-P single bond. D. Nitrogen has highest density in its group due to small size. E. The maximum covalency of nitrogen is four sin

Step-by-step solution

Statement A is correct. Nitrogen in oxidation states from +1 to +4 tends to disproportionate in acidic medium. For example, 3HNO₂ HNO₃ + H₂O + 2NO . Statement B is incorrect. Nitrogen does not have d-orbitals in its valence shell, so it cannot form d - p multiple bonds. It forms p - p multiple bonds. Statement C is incorrect. The N-N single bond is weaker than the P-P single bond due to high interelectronic repulsion between the non-bonding electrons, which arises from the small N-N bond length. Statement D is inco