Decomposition of oxalic acid in presence of conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) gives: (A...

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Decomposition of oxalic acid in presence of conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) gives:
(A) CO
(B) \( \mathrm{CO}_{2} \)
(C) formic acid
(D) \( \mathrm{H}_{2} \mathrm{O} \)
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