Among the following, correct statement is :

Options

A. Sols of metal sulphides are lyophilic
B. Brownian movement is more pronounced for smaller particles than for bigger-particles
C. One would expect charcoal to adsorb chlorine more than hydrogen sulphide
D. Hardy Schulze law states that bigger the size of the ion is, the greater is its coagulating power.

Answer

To solve the question regarding the correct statement among the given options, we will analyze each statement step by step.

### Step 1: Analyze the First Statement
**Statement:** The sols of metal sulphides are lyophilic.

**Analysis:**
- Metal sulphides, such as arsenic sulphide, are known to be lyophobic, not lyophilic.
- Lyophobic sols have little to no affinity for the solvent, meaning they do not interact well with the dispersion medium.

**Conclusion:** This statement is **incorrect**.

### Step 2: Analyze the Second Statement
**Statement:** The Brownian movement is more pronounced for smaller particles than for bigger ones.

**Analysis:**
- Brownian movement is caused by the collision of particles with the molecules of the dispersion medium.
- Smaller particles experience more collisions and thus move more rapidly than larger particles.
- Therefore, the speed of the moving particles is inversely proportional to their size.

**Conclusion:** This statement is **correct**.

### Step 3: Analyze the Third Statement
**Statement:** One would expect charcoal to absorb chlorine more than hydrogen sulfide.

**Analysis:**
- Charcoal is known to absorb gases based on their properties.
- Hydrogen sulfide is an easily liquefiable gas, which means it has a higher critical temperature and stronger van der Waals forces compared to chlorine.
- This makes hydrogen sulfide more readily absorbed by charcoal than chlorine.

**Conclusion:** This statement is **incorrect**.

### Step 4: Analyze the Fourth Statement
**Statement:** The Hardy-Schul's law states that because the size of the ion, greater is its coagulating power.

**Analysis:**
- Hardy-Schul's law relates to the coagulation of colloidal solutions and states that the coagulating power is influenced by the charge and valency of the ions.
- It is generally observed that smaller ions have a greater coagulating power due to their charge density, while larger ions do not necessarily correlate with greater coagulation.

**Conclusion:** This statement is **incorrect**.

### Final Conclusion
After analyzing all statements, the only correct statement is the second one regarding Brownian movement.

### Summary of Correct Statement:
- The correct statement is: **The Brownian movement is more pronounced for smaller particles than for bigger ones.**