Compound A is the light crystaline solid .IT gives the following tests:
i. IT dissolves in dilute sulphuric acid, NO gas is produced
ii. A drop of `MnO_(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 D is left behind
iv . THe gas mixture (B and C) is passed into a dchromate solution .The solution turn green
v. THe green solution from step (iv) gives a white precipitate E with a soluttion of barium nitrate .
vi. Residue D from step (iii) is heated on charcoal in a reducing flame it gives a magnetic subsytance .Name the compounds A,B,C, D and E

Explanation

To solve the question step by step, we will analyze the information given and deduce the compounds A, B, C, D, and E based on the tests described.

### Step 1: Identify Compound A
- **Observation**: Compound A is a light crystalline solid that dissolves in dilute sulfuric acid without producing any gas.
- **Analysis**: Since no gas is produced, A is likely a salt that does not release any gaseous products upon reaction with sulfuric acid. A common candidate is a carbonate salt.

### Step 2: Test with MnO4
- **Observation**: When a drop of MnO4 is added to the solution of A, the pink color disappears.
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