Name the gas evolved in each of the following cases : Action of heat on lead oxide.

Explanation

To solve the problem of identifying the gas evolved when heat is applied to lead oxide, we can break down the process into clear steps:

### Step-by-Step Solution:

1. **Identify the Lead Oxides**:
- Lead exists in two common oxidation states, leading to two primary oxides: lead(II) oxide (PbO) and lead(IV) oxide (PbO2).

2. **Consider the Thermal Stability**:
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