Why does `ZnO` show increased electrical conductivity and turns yellow on heating?

Explanation

To understand why zinc oxide (ZnO) shows increased electrical conductivity and turns yellow on heating, we can break down the explanation into a series of steps:

### Step 1: Heating of Zinc Oxide
When ZnO is heated, it undergoes thermal decomposition. The heat causes the ZnO to dissociate into zinc ions (Zn²⁺) and oxygen gas (O₂), along with the release of two electrons (2e⁻).

**Hint:** Heating causes a chemical change in ZnO, leading to the formation of charged species.

### Step 2: Formation of Charged Species
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