Fusion mixutre is

Options

A. `Na_(2)CO_(3) + K_(2)CO_(3)`
B. `Na_(2)CO_(3) + NaHCO_(3)`
C. `Na_(2)CO_(3) + NaOH`
D. `Na_(2)CO_(3) + K_(2)SO_(4)`

Explanation

### Step-by-Step Solution:

1. **Definition of Fusion Mixture**: A fusion mixture is a combination of certain salts that are used in qualitative analysis to detect the presence of various elements in organic compounds.

2. **Components of Fusion Mixture**: The fusion mixture primarily consists of sodium salts and potassium salts. Specifically, it includes:
- Sodium carbonate (Na2CO3)
- Potassium carbonate (K2CO3)

3. **Purpose of Fusion Mixture**: The fusion mixture is used to fuse with organic compounds. This process helps in breaking down the organic material, allowing for the detection of various functional groups or elements present in the compound.

4. **Application in Qualitative Analysis**: When the fusion mixture is heated with an organic compound, it helps in the formation of soluble salts, which can then be analyzed to identify the presence of specific elements such as halogens, nitrogen, sulfur, and phosphorus.

5. **Summary of Fusion Mixture Composition**: In summary, the fusion mixture consists of:
- Sodium carbonate (Na2CO3)
- Potassium carbonate (K2CO3)