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Question

Sodium oxalate on heating with conc H2SO4 gives


A

CO only

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B

CO and CO2

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C

CO2 only

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D

SO2 and SO3

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Solution

The correct option is B

CO and CO2


First, the the oxalate is converted to oxalic acid, which gets dehydrated. So overall, sodium oxalate reacts with conc. H2SO4 to form CO and CO2 gas:

(COOH)2Δ−−−H2SO4CO(g)+CO2+H2O


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