Which has least gold number

Options

A. Gelatin
B. Starch
C. Albumin
D. Blood

Explanation

To determine which substance has the least gold number, we will analyze the gold numbers of the given substances step by step.

### Step-by-Step Solution:

1. **Understanding Gold Number**:
- The gold number is a measure of the protective power of a colloid. It is inversely proportional to the protecting power; that is, a lower gold number indicates a higher protective power.

2. **List the Gold Numbers**:
- We need to gather the gold numbers for the substances provided in the question:
- Gelatin: 0.0052001
- Starch: 25250
- Albumin: 0.10202
- Hemoglobin: 0.03

3. **Compare the Gold Numbers**:
- Now, we will compare the gold numbers to find the least one:
- Gelatin: 0.0052001
- Starch: 25250
- Albumin: 0.10202
- Hemoglobin: 0.03

4. **Identify the Least Gold Number**:
- From the comparison:
- Gelatin has the lowest gold number at 0.0052001.
- Starch has the highest gold number at 25250.
- Albumin and Hemoglobin have higher gold numbers than Gelatin but lower than Starch.

5. **Conclusion**:
- Therefore, the substance with the least gold number is **Gelatin**.

### Final Answer:
The substance with the least gold number is **Gelatin (0.0052001)**.