Relative lowering of vapour pressure, osmotic Pressure of a solution and elevation in boiling points are ............ properties. Osmosis is the passage of ................... through a semipermeable membrane from a solution of ............... towards a solution of ................. Osmotic pressure is equivalent to mechanical pressure which must be applied on ................. to prevent osmosis.

Options

A. Colligative, solvent, lower concentration, higher concentration, solution.
B. Colligative, solution, lower concentration, higher concentration, solvent.
C. Colligative, solvent, higher concentration, lower concentration, solution.
D. Colligative, solution, higher concentration, lower concentration, solution.

Explanation

To solve the question step by step, we will fill in the blanks based on the concepts of colligative properties and osmosis.

### Step-by-Step Solution:

1. **Identify the type of properties**:
- The question states: "Relative lowering of vapour pressure, osmotic pressure of a solution, and elevation in boiling points are __________ properties."
- These properties depend on the number of solute particles in a solution rather than their identity. Therefore, the correct term to fill in the blank is **colligative properties**.

2. **Understanding osmosis**:
- The next part of the question states: "Osmosis is the passage of __________ through a semipermeable membrane."
- A semipermeable membrane allows only certain particles to pass through, specifically, it allows solvent molecules to pass while blocking solute particles. Hence, the correct term to fill in the blank is **solvent**.

3. **Direction of osmosis**:
- The question continues: "Osmosis is the passage of solvent through a semipermeable membrane from a solution of __________ towards a solution of __________."
- Osmosis occurs from a region of lower solute concentration (or higher solvent concentration) to a region of higher solute concentration (or lower solvent concentration). Therefore, the first blank should be filled with **lower concentration** and the second blank with **higher concentration**.

4. **Osmotic pressure**:
- The final part of the question states: "Osmotic pressure is equivalent to mechanical pressure which must be applied on __________ to prevent osmosis."
- To prevent osmosis, mechanical pressure must be applied to the solution. Thus, the correct term to fill in the blank is **solution**.

### Final Answer:
Relative lowering of vapour pressure, osmotic pressure of a solution, and elevation in boiling points are **colligative properties**. Osmosis is the passage of **solvent** through a semipermeable membrane from a solution of **lower concentration** towards a solution of **higher concentration**. Osmotic pressure is equivalent to mechanical pressure which must be applied on **solution** to prevent osmosis.