Th esodium carbobate bead test test is which `Na_(2)CO_(3)` is along instead of barax it is solution to chromiam and ____.

Answer

### Step-by-Step Solution:

1. **Understanding the Sodium Carbonate Bead Test**:
The sodium carbonate bead test is a qualitative analysis method used to identify certain metal ions based on the color of the bead formed when heated with sodium carbonate (Na2CO3) and a nitrate salt.

2. **Identifying the Metals**:
The two metals that can be identified using the sodium carbonate bead test are manganese (Mn) and chromium (Cr).

3. **Reactions Involved**:
- For **Manganese**:
- When manganese oxide (MnO) is heated with sodium carbonate and potassium nitrate (KNO3), the reaction is:
\[ \text{Na}_2\text{CO}_3 + \text{KNO}_3 + \text{MnO} \rightarrow \text{NH}_4\text{MnO}_4 + \text{CO}_2 \]
- This reaction produces a **green bead** of sodium manganate.

- For **Chromium**:
- When chromium oxide (Cr2O3) is heated with sodium carbonate and potassium nitrate, the reaction is:
\[ \text{Na}_2\text{CO}_3 + \text{KNO}_3 + \text{Cr}_2\text{O}_3 \rightarrow \text{Na}_2\text{CrO}_4 + \text{CO}_2 \]
- This reaction produces a **yellow bead** of sodium chromate.

4. **Conclusion**:
The metals identified using the sodium carbonate bead test are **manganese (Mn)** and **chromium (Cr)**.

### Final Answer:
The sodium carbonate bead test is used for identifying **chromium and manganese**.

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