The major products obtained in the reaction of oxalic acid with conc. $H_{2} S O_{4}$ upon heating are:

C O, C O_{2}, H_{2} O

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C O, S O_{2}, H_{2} O

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H_{2} S, C O, H_{2} O

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H C O O H, H_{2} S, C O

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Solution

The correct option is A $C O, C O_{2}, H_{2} O$
On heating, oxalic acid gets dehydrated and decomposed.
$(C O O H)_{2} . H_{2} O + H_{2} S O_{4} Δ - \to C O_{2} + C O + [H_{2} S O_{4} .3 H_{2} O]$

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