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What happens when concentrated sulphuric...

What happens when concentrated sulphuric acid is heated with oxalic acid ?

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Dehydration takes place OR CO and `CO_(2)` is liberated
`{:(COOH),(|),(COOH):}+"Conc. "H_(2)SO_(4)rarr CO+CO_(2)+H_(2)SO_(4).H_(2)O`
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