Nitrogen acid

Nitrogen acid may refer to:

Nitric acid, HNO₃
Nitrous acid, HNO₂
Hyponitrous acid, H₂N₂O₂

or the less common nitrogen species:

Nitroxyl, HNO
Nitroxylic acid, H₄N₂O₄
Peroxynitrous acid, HOONO
Peroxynitric acid, HOONO₂