The separation of colloidal particles from electrolyte particles by use of a filter paper is called

Options

A. Osmosis
B. Ultrafiltration
C. Reverse Osmosis
D. Electrodialysis

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of the process used to separate colloidal particles from electrolyte particles using filter paper.

2. **Identifying the Process**: The process that is specifically designed for this type of separation is known as **ultrafiltration**.

3. **Preparation of Filter Paper**: To perform ultrafiltration, filter paper is first treated with a colloidal or gelatin solution. This step is crucial as it prepares the filter paper for the separation process.

4. **Hardening the Filter Paper**: After treating the filter paper, it is then dipped in formaldehyde. This step hardens the filter paper, making it more effective for ultrafiltration.

5. **Using Colloidin**: A 4% solution of nitrocellulose, known as colloidin, is used in this process. Colloidin is a mixture of alcohol and ether that helps to reduce the pore size of the filter paper.

6. **Decreasing Pore Size**: The treatment with colloidin and formaldehyde reduces the pore size of the filter paper, allowing it to effectively separate colloidal particles from electrolyte particles.

7. **Final Result**: The filter paper that has been treated and hardened is referred to as **ultra filter paper**. This paper is then used in the process of ultrafiltration to achieve the desired separation.

8. **Conclusion**: Therefore, the separation of colloidal particles from electrolyte particles by the use of filter paper is called **ultrafiltration**.

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