Hyponitrous acid is a chemical compound with formula H ₂N ₂O ₂ or HON=NOH. It is an isomer of nitramide, H₂N−NO₂; and a formal dimer of azanone, HNO. Hyponitrous acid forms two series of salts, the hyponitrites containing the [ON=NO]²⁻ anion, and... Wikipedia