IN the borax bead test which compound is formed ?

Options

A. Orthoborate
B. Metaborate
C. Double oxide
D. Tetraborate

Explanation

To answer the question about the compound formed in the borax bead test, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Borax**:
- Borax is chemically represented as Na2B4O7·10H2O. It contains sodium (Na), boron (B), and oxygen (O) along with water of crystallization (10H2O).

2. **Heating Borax**:
- When borax is heated, the water of crystallization (10H2O) is released. The remaining compound after losing water is Na2B4O7.

3. **Further Heating**:
- Upon further heating of Na2B4O7, it undergoes a decomposition reaction to form two products:
- Sodium metaborate (NaBO2)
- Boric anhydride (B2O3)

4. **Identifying the Compounds**:
- Sodium metaborate (NaBO2) is the compound that is formed during the borax bead test.
- Boric anhydride (B2O3) is also produced but is not the primary focus of the question.

5. **Conclusion**:
- Therefore, the compound formed in the borax bead test is sodium metaborate (NaBO2).

### Final Answer:
The compound formed in the borax bead test is sodium metaborate (NaBO2).