The soda used for washing the clothes is

Options

A. `CaCO_(3)`
B. `Na_(2)CO_(3) *10 H_(2) O`
C. NaCl
D. `Na_(2)SO_(4)`

Explanation

### Step-by-Step Solution:

1. **Identify the Type of Soda Used for Washing Clothes:**
- The question asks about the type of soda that is commonly used for washing clothes.

2. **Determine the Common Name:**
- The soda that is typically used for laundry is known as "washing soda."

3. **Chemical Composition:**
- Washing soda is chemically known as sodium carbonate, which has the formula Na2CO3.

4. **Hydrated Form:**
- Washing soda is often found in its hydrated form, which is sodium carbonate decahydrate. This means it has ten water molecules associated with it, represented as Na2CO3·10H2O.

5. **Functionality:**
- Washing soda acts as a detergent and is effective in softening hard water, making it easier to wash clothes.

6. **Conclusion:**
- Therefore, the soda used for washing clothes is sodium carbonate, specifically in its hydrated form, Na2CO3·10H2O.

### Final Answer:
The soda used for washing clothes is **sodium carbonate (Na2CO3·10H2O)**.

---