Salt Analysis

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 KMnO₄
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 E.

Name the compounds A, B, C, D and E.