Borax is prepared by treating coleminate with

Options

A. `NaNO_(3)`
B. `NaCl`
C. `Na_(2)CO_(3)`
D. `NaHCO_(3)`

Explanation

To solve the question regarding the preparation of borax from colemanite, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Composition of Colemanite**:
- Colemanite is a borate mineral with the chemical formula Ca2B6O11·5H2O.

2. **Determine the Reaction with Sodium Carbonate**:
- When colemanite (Ca2B6O11) reacts with sodium carbonate (Na2CO3), it undergoes a chemical reaction upon heating.

3. **Write the Balanced Chemical Equation**:
- The reaction can be represented as follows:
\[ Ca_2B_6O_{11} + 2 Na_2CO_3 \rightarrow Na_2B_4O_7 + CaCO_3 + 2 NaBO_2 + 5 H_2O \]
- In this reaction, sodium carbonate reacts with colemanite to produce borax (Na2B4O7), calcium carbonate (CaCO3), sodium metaborate (NaBO2), and water.

4. **Identify the Product**:
- The main product of interest here is borax, which is sodium tetraborate (Na2B4O7).

5. **Conclusion**:
- Therefore, borax is prepared by treating colemanite with sodium carbonate (Na2CO3).

### Final Answer:
Borax is prepared by treating colemanite with sodium carbonate (Na2CO3).

---