Which one of the following statements is FALSE for hydrophilic sols?

Options

A. Their viscosity is of the order of that of `H_2O`
B. The sols cannot be easily coagulated.
C. They do ot require electroytes for stability .
D. These sols are reversible in nature .

Answer

To determine which statement is FALSE for hydrophilic sols, we need to analyze the properties of hydrophilic colloids. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Hydrophilic Sols
Hydrophilic sols are colloidal systems that are water-loving. They have a strong affinity for water and are typically stable in aqueous solutions.

### Step 2: Analyze the Properties of Hydrophilic Sols
1. **Water Loving**: Hydrophilic sols attract water molecules. This property indicates their affinity towards the dispersion medium (water).
2. **Reversible Nature**: Hydrophilic sols can be easily separated into their dispersed phase and dispersion medium. They can also be mixed back to form the sol again, indicating their reversible nature.
3. **Surface Tension and Viscosity**: The surface tension of hydrophilic sols is generally lower than that of water, while their viscosity is similar to that of water.
4. **Coagulation**: Hydrophilic sols can be coagulated by adding electrolytes. This means that they require electrolytes for stability, and the addition of electrolytes can lead to their coagulation.

### Step 3: Evaluate the Options
Now we can evaluate the given options to identify which statement is false:
- **Option A**: They need electrolytes for stability. (This is TRUE; they can be coagulated by electrolytes.)
- **Option B**: Viscosity is the same as water. (This is TRUE; their viscosity is similar to water.)
- **Option C**: They are reversible in nature. (This is TRUE; they can be easily separated and remixed.)
- **Option D**: They can't be coagulated easily. (This is FALSE; hydrophilic sols can be easily coagulated by adding electrolytes.)

### Conclusion
The false statement regarding hydrophilic sols is **Option D**: "They can't be coagulated easily."