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Q 2637756682.     Compound `A` is a light green crystalline solid. It gives the following tests
(i) It dissolves in dilute sulphuric acid. No gas is produced.
(ii) A drop of `KMnO_4` is added to the above solution. The pink colour disappears.
(iii) Compound A is heated strongly. Gases B and C, with pungent smell, come out. A brown residue D is left behind.
(iv) The gas mixture (B and C) is passed into a dichromate solution. The solution turns green.
(v) The green solution from step (iv) gives a white precipitate E with a solution of barium nitrate.
(vi) Residue D from step (iii) is heated on charcoal in a reducing flame. It gives a magnetic substance.
Name the compound A, B, C, D and E.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)