For properties like bond order and dipole moment, remember to apply the molecular orbital theory and the structure of molecules to determine the correct order.
We are given several orders and their corresponding properties. Let us check the correctness of each order and property:
- Order i: NH₃>H₂O>SO₂ (Bond angle): The bond angle in NH₃ (107.5°) is greater than that in H₂O (104.5°), which in turn is greater than SO₂ (119.5°). So, this match is correct.
- Order ii: H₂O>NH₃>HS⁻ (Dipole moment): H₂O has the highest dipole moment, followed by NH₃, and HS⁻ has the lowest dipole moment. Thus, this match is correct.
- Order iii: N₂>O₂>H₂ (Bond enthalpy): N₂ has the highest bond enthalpy due to its strong triple bond, followed by O₂, and then H₂ with the lowest bond enthalpy. This match is correct.
- Order iv: NO⁺>O₂⁺ (Bond order): NO⁺ has a higher bond order compared to O₂⁺, as indicated by molecular orbital theory. Hence, this match is correct.
Thus, the correct answer is \( {ii, iii, iv only} \).
