H2C2O4 (Oxalic acid) Δ→ gas (A) + gas (B) + liquid (C)
Gas (A) burns with a blue flame and is oxidised to gas (B). Gas (B) turns lime water milky.
Gas (A) + Cl2 → (D) (NH3,Δ) → (E)
A, B, C, D and E are respectively
(a) CO2, CO, H2O, HCOONH2, COCl2
(b) CO, CO2, COCl2, H2O, HCOONH2
(c) CO, CO2, H2O, COCl2, NH2CONH2
(d) CO, CO2, H2O, NH2CONH2, COCl2
