Relative lowering of vapour pressure , osmotic pressure of a solution and elevation in boiling points are __(p)___ properties. Osmosis is the passage of __(q)__ through a semipermeable membrane from a solution of __(r)__ towards a solution of __(s)__ . Osmotic pressure is equivalent to mechanical pressure which must be applied on __(t)__ to prevent osmosis.
In the above paragraph p,q,r,s and t respectively are

Options

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

Answer

To solve the question, we need to fill in the blanks (p, q, r, s, t) with the appropriate terms related to colligative properties and osmosis. Let's break it down step by step.

### Step 1: Identify the properties
The first part of the question states that relative lowering of vapor pressure, osmotic pressure of a solution, and elevation in boiling points are ___(p)___. These properties depend on the number of solute particles in a solution rather than their identity. Therefore, they are known as **colligative properties**.

**Answer for (p):** Colligative properties

### Step 2: Define osmosis
Next, the question describes osmosis as the passage of ___(q)___ through a semipermeable membrane. In osmosis, it is the solvent that moves through the membrane from an area of lower solute concentration to an area of higher solute concentration. Thus, the answer for (q) is **solvent**.

**Answer for (q):** Solvent

### Step 3: Concentration definitions
The passage continues with a solution of ___(r)___ towards a solution of ___(s)___. In osmosis, the solvent moves from a solution with a lower concentration of solute (higher concentration of solvent) to a solution with a higher concentration of solute (lower concentration of solvent). Therefore, we define:
- (r) as **lower concentration** (of solute)
- (s) as **higher concentration** (of solute)

**Answer for (r):** Lower concentration
**Answer for (s):** Higher concentration

### Step 4: Mechanical pressure
Finally, the question states that osmotic pressure is equivalent to the mechanical pressure which must be applied on ___(t)___ to prevent osmosis. Since we are discussing the pressure applied to stop the flow of solvent, the answer for (t) is **solution**.

**Answer for (t):** Solution

### Final Answers
So, compiling all the answers together:
- (p) = Colligative properties
- (q) = Solvent
- (r) = Lower concentration
- (s) = Higher concentration
- (t) = Solution