MCQ
Which of the following can act both as an oxidising as well as reducing agent ?
- ✓$HNO_2$
- B$KMnO_4$
- C$H_2S$
- D$H_2SO_4$
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$\begin{array}{*{20}{c}}
{OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3} - CH - COOH\xrightarrow{\Delta }}
\end{array}$