Answer: option (1) different physical properties and different chemical properties.
Justification:
1) Any chemical compound has its unique physical and chemical properties.
2) Although formed by the same elements, N and O, NOâ‚‚ and Nâ‚‚O are different compounds, so each will have its proper physical and chemical properties.
3) The union of the atoms by chemical bonds confere the properties to a matter, so being the bonds in Nâ‚‚O different to the bonds in Nâ‚‚O means they are different compounds.