Salt (A) is a white deliquescent solid. On heating the solid, brown fumes were evolved. On adding NaOH to the salt solution of (A), a white gelatinous ppt. was obtained. On adding, a drop of blue litmus solution to the ppt., a blue lake was obtained. On adding DPA to the salt solution, a deep blue colouration was obtained. Identify the salt and give the equations involved.

Explanation

To identify the salt (A) and provide the equations involved, let's analyze the information given step by step.

### Step 1: Identify the nature of salt (A)
- The salt (A) is described as a white deliquescent solid that evolves brown fumes upon heating.
- The brown fumes are likely nitrogen dioxide (NO₂), which suggests that the salt could be a nitrate. A common nitrate that fits this description is aluminum nitrate \((\text{Al(NO}_3\text{)}_3)\).

### Step 2: Write the equation for the thermal decomposition of aluminum nitrate
When aluminum nitrate is heated, it decomposes to produce aluminum oxide, nitrogen dioxide, and oxygen. The balanced equation for this reaction is:
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