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The major products obtained in the reaction of oxalic acid with conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ upon heating are
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$\mathrm{CO}_{2} \mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}$
Conc. sulphuric acid is a strong dehydrating agent. Upon reaction with oxalic acid at elevated temperature, it removes water, carbon monoxide and carbon dioxide as
\(\underset{\text{hydrated}}{\mathrm{HOOC}}-\underset{\text{oxalic}}{\mathrm{COOH}} .\underset{\text{acid}}{2 \mathrm{H}_{2} \mathrm{O}}+\underset{\text{hot, conc.}}{\mathrm{H}_{2} \mathrm{SO}_{4}} \rightarrow \underset{\text{water}}{3 \mathrm{H}_{2} \mathrm{O}}+ \underset{\text{carbon monoxide}}{\mathrm{CO}}+\underset{\text{carbon dioxide}}{\mathrm{CO}_{2}}\)
\(\underset{\text{hydrated}}{\mathrm{HOOC}}-\underset{\text{oxalic}}{\mathrm{COOH}} .\underset{\text{acid}}{2 \mathrm{H}_{2} \mathrm{O}}+\underset{\text{hot, conc.}}{\mathrm{H}_{2} \mathrm{SO}_{4}} \rightarrow \underset{\text{water}}{3 \mathrm{H}_{2} \mathrm{O}}+ \underset{\text{carbon monoxide}}{\mathrm{CO}}+\underset{\text{carbon dioxide}}{\mathrm{CO}_{2}}\)
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