Pick one material from the following which is completely soluble in water.

Options

A. Chalk powder
B. Tea leaves
C. Glucose
D. Saw dust

Explanation

To determine which material is completely soluble in water from the options provided (chalk powder, tea leaves, glucose, and soda), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Solubility**: Solubility refers to the ability of a substance to dissolve in a solvent (in this case, water). A substance that is completely soluble will mix uniformly with the solvent.

2. **Analyze Each Option**:
- **Chalk Powder**: Chalk is a form of calcium carbonate, which does not dissolve in water. It tends to settle at the bottom instead.
- **Tea Leaves**: Tea leaves are solid particles that do not dissolve completely in water. They may release flavor but do not become part of the liquid.
- **Glucose**: Glucose is a simple sugar that dissolves completely in water. When mixed, it forms a homogeneous solution.
- **Soda**: Soda is a carbonated beverage that contains dissolved carbon dioxide and other ingredients. While it is a solution, the solid components (like sugar) may not be completely soluble depending on the concentration.

3. **Conclusion**: Among the given options, glucose is the only material that is completely soluble in water.

### Final Answer:
**Glucose is completely soluble in water.**

---