What 2 reagents are required to form NO2+ (state conditions)? Write an equation for this reaction.

Concentrated sulphuric acid (H₂SO₄) and concentrated nitric acid (HNO₃).H₂SO₄ + HNO₃ -> HSO₄^- + H₂NO₃⁺H₂NO₃⁺ <-> (equilibrium arrow, do not penalise if normal arrow used) H₂O + NO₂^+Alternatively accept: HNO₃ + H₂SO₄ -> NO₂⁺ + HSO₄^- + H₂O