Determine the oxidation number of following underlined elements:HNO3

HN_O3: By rules, 1+a+3(−2)=0⇒a=+5By fundamental approachOxidation number of H = + 1Oxidation number of N=+1[Covale Bond with O] + (+2)[Two covalent bonds O; N being less Electronegative than O] + (+2)=+5[Coordinate bond]