The amount of solute required to prepare 10L of decimolar solution is:

Options

A. 0.01 mole
B. 0.2 mole
C. 0.05 mole
D. 1 mole

Explanation

To find the amount of solute required to prepare 10 liters of a decimolar (0.1 M) solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Decimolar Solution**:
- A decimolar solution (0.1 M) means that there are 0.1 moles of solute per liter of solution.

2. **Calculate the Total Moles of Solute Required**:
- Since we need to prepare 10 liters of a decimolar solution, we can calculate the total moles of solute required using the formula:
\[ \text{Total Moles} = \text{Molarity} \times \text{Volume} \]
- Here, Molarity (M) = 0.1 moles/L and Volume (V) = 10 L.
- Substituting the values:
\[ \text{Total Moles} = 0.1 \, \text{moles/L} \times 10 \, \text{L} = 1 \, \text{mole} \]

3. **Conclusion**:
- Therefore, to prepare 10 liters of a decimolar solution, you need 1 mole of solute.

### Final Answer:
The amount of solute required to prepare 10 L of decimolar solution is **1 mole**.

---