Question

Identify the correct statement from following.

• A. The vapour pressure of a solvent increases by dissolving nonvolatile solute into it.
• B. The boiling point of solvent decreases by dissolving a nonvolatile solute into it.
• C. The osmotic pressure of electrolytic solution is greater than nonelectrolytic solution of the same concentration.
• D. The freezing point of solvent is a colligative properly.

Hint:

Electrolytes give more particles, so they have a larger colligative effect.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Colligative properties depend on the number of solute particles, not their nature. Electrolytes dissociate into ions, so they give more particles.

Step 2: Check (A):
A non-volatile solute lowers the vapour pressure of the solvent, so (A) is false.

Step 3: Check (B):
A non-volatile solute raises the boiling point (elevation), so (B) is false.

Step 4: Check (C):
\(\pi = i\,CRT\) with \(i > 1\) for electrolytes. So an electrolyte solution has a greater osmotic pressure than a non-electrolyte of the same concentration. (C) is true.

Step 5: Check (D):
The freezing point itself is a property of the solvent. Its depression is the colligative property, so (D) as stated is false.

Final Answer:
Only statement (C) is correct. \[ \boxed{\text{(C)}} \]