Particles of which of the following do not pass through ultra filter paper 

Options

A. colloids only
B. true solutions
C. suspensions only
D. colloids and suspension

Answer

To determine which particles do not pass through ultra filter paper, we need to analyze the different types of mixtures: true solutions, colloidal solutions, and suspensions.

### Step-by-Step Solution:

1. **Understanding Ultra Filter Paper**:
- Ultra filter paper has very small pores that can filter out particles based on their size. Only very small particles can pass through it.

2. **Types of Mixtures**:
- **True Solutions**: These consist of very small particles (molecules or ions) that are homogeneous and cannot be seen with the naked eye. They can easily pass through ultra filter paper.
- **Colloidal Solutions**: These contain larger particles than true solutions but smaller than those in suspensions. They are heterogeneous and cannot pass through ultra filter paper due to their size.
- **Suspensions**: These contain even larger particles that are visible to the naked eye and will settle over time. They also cannot pass through ultra filter paper.

3. **Analyzing the Options**:
- **Colliders Only**: This option refers to colloidal solutions, which cannot pass through ultra filter paper.
- **True Solutions Only**: This option is incorrect because true solutions can pass through ultra filter paper.
- **Suspensions**: This option is also correct as suspensions cannot pass through ultra filter paper.
- **Either Colloidal or Suspension**: This option is correct because both colloidal solutions and suspensions cannot pass through ultra filter paper.

4. **Conclusion**:
- The particles that do not pass through ultra filter paper are both colloidal solutions and suspensions. Therefore, the correct answer is option four: "either colloidal or suspension".

### Final Answer:
**Particles of which of the following do not pass through ultra filter paper?**
- **Answer**: Either colloidal or suspension.