The compound that cannot act both as oxidising and reducing agent is: [JEE Main 2020, 9 Jan (Shift 1)]

\({\mathrm{HNO}}_{2}\)

\({\mathrm{H}}_{3}{\mathrm{PO}}_{4}\)

\({\mathrm{H}}_{2}{\mathrm{SO}}_{3}\)

\({\mathrm{H}}_{2}{\mathrm{O}}_{2}\)