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Reference.org
Peroxynitric acid
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<p>Peroxynitric acid or peroxonitric acid is a <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> HNO4. It is an <a href="/facts/Oxyacid/p0bMdwSx">oxyacid</a> of nitrogen, after <a href="/facts/Peroxynitrous_acid/Y2U8md2a">peroxynitrous acid</a>. </p>