Give one method for industrial preparation `CO_2`

Explanation

**Step-by-Step Solution:**

1. **Identify the Source Material**: The industrial preparation of carbon dioxide (CO₂) can be done using limestone, which is chemically known as calcium carbonate (CaCO₃).

2. **Heating the Limestone**: When limestone (CaCO₃) is heated, it undergoes a thermal decomposition reaction. This process requires high temperatures.

3. **Chemical Reaction**: The chemical reaction for the thermal decomposition of limestone can be represented as follows:
\[ \text{CaCO}_3 (s) \xrightarrow{\text{heat}} \text{CaO} (s) + \text{CO}_2 (g) \]
Here, calcium carbonate decomposes into calcium oxide (CaO) and carbon dioxide (CO₂).

4. **Collection of CO₂**: The carbon dioxide gas produced during this reaction can be collected and used for various industrial applications.

**Final Answer**: One method for the industrial preparation of carbon dioxide (CO₂) is by heating limestone (calcium carbonate, CaCO₃) to produce calcium oxide (CaO) and carbon dioxide (CO₂).

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