Which of the following is/are not lyophobic in nature?

Options

A. `AS_(2)S_(3)`
B. Sulphur
C. Starch
D. Protien

Answer

### Step-by-Step Solution:

1. **Understanding the Terms**:
- Define lyophilic and lyophobic solutions.
- Lyophilic solutions are those that have a strong affinity for the solvent (water), meaning they are "water-loving".
- Lyophobic solutions, on the other hand, have little to no affinity for the solvent, meaning they are "water-repellent".

2. **Identify Examples**:
- List examples of lyophilic solutions: Starch, proteins, and gelatin are common examples.
- List examples of lyophobic solutions: Elemental sulfur, arsenic trisulfide (As₂S₃), and some hydroxides.

3. **Analyze the Question**:
- The question asks for substances that are **not** lyophobic, which means we are looking for lyophilic substances.

4. **Determine the Correct Answers**:
- From the examples identified, starch and proteins are lyophilic and therefore **not lyophobic**.
- Elemental sulfur and arsenic trisulfide are lyophobic.

5. **Conclude**:
- The substances that are **not lyophobic** in nature are **starch and proteins**.

### Final Answer:
Starch and proteins are not lyophobic in nature; they are lyophilic.

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