Which of these substances is used to obtain vulcanized rubber?

Options

A. Zinc
B. Sulphur
C. Chromium
D. Phosphorus

Answer

To determine which substance is used to obtain vulcanized rubber, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Vulcanized Rubber**:
- Vulcanized rubber is a modified form of natural rubber that has improved properties such as elasticity, strength, and resistance to temperature changes.

2. **Identify the Need for Vulcanization**:
- Natural rubber has limitations, such as being prone to breaking and having poor elastic properties. Vulcanization enhances these properties, making the rubber more durable and versatile.

3. **Learn About the Process of Vulcanization**:
- The process of vulcanization involves creating cross-linking bonds between rubber molecules. This is what gives vulcanized rubber its enhanced characteristics.

4. **Determine the Substance Used in Vulcanization**:
- The key ingredient in the vulcanization process is sulfur. When natural rubber is mixed with sulfur and heated, it forms cross-links, resulting in vulcanized rubber.

5. **Evaluate the Given Options**:
- The options provided are zinc, sulfur, chromium, and phosphorus. Based on our understanding, sulfur is the substance that is used to obtain vulcanized rubber.

6. **Conclude the Answer**:
- Therefore, the correct answer to the question is **sulfur**.

### Final Answer:
The substance used to obtain vulcanized rubber is **sulfur**.

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