Give an example of a material used for makin gsemipermeable membrance for carrying out reverse osmosis.

Explanation

To answer the question regarding an example of a material used for making semi-permeable membranes for reverse osmosis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Reverse Osmosis (RO)**:
- Reverse osmosis is a water purification process that utilizes a semi-permeable membrane to separate unwanted molecules, ions, and larger particles from water.

2. **Identifying the Material**:
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