Which of the following is not correctly matched ?

Options

A. Gelatin -Lyophilic colloid
B. Gold sol-Lyophilic colloid
C. Arsenious sulphide-Lyophobic colloid
D. Ferric hydroxide-Lyophobic colloid

Explanation

To solve the question of which of the following is not correctly matched, we need to understand the definitions and characteristics of lyophilic and lyophobic colloids.

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Lyophilic Colloids**: These are colloids that are solvent-loving. They have a strong attraction to the solvent molecules, which allows them to easily disperse in the solvent. Examples include gelatin and starch.
- **Lyophobic Colloids**: These are colloids that are solvent-hating. They have little to no attraction to the solvent molecules, making them less stable in the solvent. Examples include gold sol and arsenic sulfide.

2. **Identify the Examples Given**:
- The question provides several examples of colloids:
- Gelatin
- Gold
- Arsenic Sulfide
- Ferric Hydroxide

3. **Classify Each Example**:
- **Gelatin**: This is a lyophilic colloid. (Correct match)
- **Gold**: This is a lyophobic colloid. (Incorrectly matched as lyophilic)
- **Arsenic Sulfide**: This is a lyophobic colloid. (Correct match)
- **Ferric Hydroxide**: This is also a lyophobic colloid. (Correct match)

4. **Determine the Incorrect Match**:
- From the classification, we see that gelatin is correctly matched as a lyophilic colloid. Gold is incorrectly matched as a lyophilic colloid since it is actually lyophobic. Both arsenic sulfide and ferric hydroxide are correctly matched as lyophobic colloids.

5. **Conclusion**:
- The option that is not correctly matched is **Gold**, which is a lyophobic colloid but is listed as lyophilic.

### Final Answer:
The incorrect match is **Gold** as it is a lyophobic colloid, not lyophilic.

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