Write chemical name and the formula of the brown gas produced during thermal decomposition of lead nitrate.

Explanation

To solve the question regarding the brown gas produced during the thermal decomposition of lead nitrate, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactant**:
- The reactant in this case is lead nitrate, which has the chemical formula \( \text{Pb(NO}_3\text{)}_2 \).

2. **Understand Thermal Decomposition**:
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