Select correct statements :

Options

A. Osmosis, like all colligative properties, results from an increase in entropy as pure solvent passes through the membrane and mixes with the solution
B. Desalination of sea-water is done by reverse osmosis
C. Both are correct statements
D. None is correct statement

Answer

To solve the question of selecting the correct statements regarding osmosis and desalination, we will analyze each statement step by step.

### Step 1: Understanding Osmosis
- **Definition**: Osmosis is the movement of water molecules from an area of higher concentration (of water) to an area of lower concentration (of water) through a semi-permeable membrane.
- **Entropy**: During osmosis, the randomness or disorder of the system increases as water molecules move from a concentrated area to a less concentrated area. This increase in randomness corresponds to an increase in entropy.

**Conclusion for Statement 1**:
- The statement "Osmosis like all colligative properties results from an increase in entropy as pure solvent passes through the membrane and mixes with the solution" is **correct**.

### Step 2: Understanding Reverse Osmosis
- **Definition**: Reverse osmosis (RO) is the process where water molecules move from an area of higher salt concentration to an area of lower salt concentration. This process requires the application of pressure to overcome the natural osmotic pressure.
- **Desalination**: Reverse osmosis is commonly used for desalination, which is the process of removing salts and other impurities from seawater to make it suitable for drinking and irrigation.

**Conclusion for Statement 2**:
- The statement "Desalination of seawater is done by reverse osmosis" is also **correct**.

### Final Conclusion
Both statements provided in the question are correct. Therefore, the correct option is that both statements are true.

### Summary of the Steps:
1. **Analyze the definition and process of osmosis**.
2. **Discuss the implications of osmosis on entropy**.
3. **Define reverse osmosis and its application in desalination**.
4. **Conclude that both statements are correct**.