Which factor is important in the formation of zinc oxide?

Options

A. High temperatures
B. Low temperatures
C. High pressures
D. Low pressures

Answer

To determine the important factor in the formation of zinc oxide (ZnO), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Formation Process**:
- Zinc oxide is formed from the decomposition of zinc hydroxide (Zn(OH)₂).

2. **Identify the Precursor**:
- Zinc hydroxide is obtained through the electrolysis of sodium bicarbonate (Na2CO3).

3. **Decomposition of Zinc Hydroxide**:
- When zinc hydroxide is subjected to strong heating, it decomposes to form zinc oxide and water. The reaction can be summarized as:
\[ \text{Zn(OH)}_2 \xrightarrow{\text{heat}} \text{ZnO} + \text{H}_2\text{O} \]

4. **Evaluate the Conditions for Decomposition**:
- The process of decomposition of zinc hydroxide is significantly influenced by temperature. Higher temperatures facilitate this decomposition process.

5. **Conclusion**:
- Since high temperatures enhance the decomposition of zinc hydroxide to zinc oxide, the important factor in the formation of zinc oxide is **high temperature**.

### Final Answer:
The important factor in the formation of zinc oxide is **high temperature**.

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