Oxalic acid on being heated up to $90^\circ C$ with conc. $H_2SO_4$ forms:

  • A
    $HCOOH + CO_2$
  • B
    $CO_2 + H_2O$
  • C
    $CO_2 + CO + H_2O$
  • D
    $HCOOH + CO$

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