State the condition resulting in reverse osmosis.

Answer

**Step-by-Step Text Solution:**

1. **Understanding Osmosis**: Osmosis is the process where solvent molecules move through a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration.

2. **Defining Reverse Osmosis**: Reverse osmosis is the process where solvent molecules move from a region of higher solute concentration to a region of lower solute concentration, which is the opposite of normal osmosis.

3. **Condition for Reverse Osmosis**: The primary condition that facilitates reverse osmosis is the application of pressure. Specifically, when pressure is applied to the side of the solution (the side with higher solute concentration), it can overcome the osmotic pressure.

4. **Mechanism**: By increasing the pressure on the solution side, the solvent molecules are forced through the semipermeable membrane, moving from the concentrated solution to the dilute solution.

5. **Conclusion**: Therefore, the condition required for reverse osmosis to occur is the application of sufficient pressure on the solution side.

---