which of the following is not matched correctly with its use?

Options

A. Piezoelectric material - Quartz
B. Ion - exchanges - Graphite
C. Filtration plants - Silica
D. Electrical insulators - Silicones

Explanation

To solve the question of which compound is not matched correctly with its use, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Compounds and Their Uses**:
- We have several compounds listed, and we need to check if their uses are correctly matched.

2. **Analyze Quartz**:
- **Use**: Quartz is used in piezoelectric materials.
- **Verification**: This is correct. Quartz is indeed used in piezoelectric applications, which are important for accurate clocks, radio broadcasting, and mobile communication.

3. **Analyze Graphite**:
- **Use**: Graphite is mentioned to be used as an ion exchange material.
- **Verification**: This is incorrect. Graphite is not used as an ion exchange material because it is not charged and does not have the properties necessary for ion exchange. It is used in making crucibles, electrodes, and other applications, but not for ion exchange.

4. **Analyze Silica**:
- **Use**: Silica (specifically Kaisalgur silica) is used in filtration plants.
- **Verification**: This is correct. Silica is commonly used in various filtration processes and is also used as an electrical insulator.

5. **Conclusion**:
- After analyzing all the options, we find that the only incorrect match is for Graphite, which is not used as an ion exchange material. Thus, the answer to the question is that the option related to Graphite is not matched correctly with its use.

### Final Answer:
The compound that is not matched correctly with its use is **Graphite** (it is incorrectly matched as an ion exchange material).

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