`H_(2)C_(2)O_(4) overset(Delta)to` gas `(A)`+gas`(B)`+liquid`( C)` oxalic acid Gas `(A)` burns with blue flame and is oxidised to gas `(B)`. Gas `(B)` turns lime water milky
Gas (A)+`Cl_(2) to (D) overset(NH_(3). Delta)to (E) overset(NH_(3). Delta) (B)`
Identify `(A)` to `(E)` and explain reactions involved.

Explanation

To solve the problem step by step, we will identify each gas and liquid formed during the decomposition of oxalic acid (H₂C₂O₄) when heated, and explain the reactions involved.

### Step 1: Decomposition of Oxalic Acid
When oxalic acid (H₂C₂O₄) is heated, it decomposes to form gases and a liquid. The reaction can be represented as:

\[ \text{H}_2\text{C}_2\text{O}_4 \xrightarrow{\Delta} \text{Gas A} + \text{Gas B} + \text{Liquid C} \]

### Step 2: Identifying Gas A and Gas B
...