Vulcanisation of Rubber is carried out to make is

Options

A. Soft
B. Elastic
C. Resistant to temperature changes
D. Hard and inelastic

Answer

**Step-by-Step Solution:**

1. **Understanding Vulcanization**:
- Vulcanization is a chemical process that involves treating natural rubber with certain chemicals, primarily sulfur. This process enhances the properties of rubber.

2. **Chemical Treatment**:
- The main chemical used in the vulcanization process is sulfur. When rubber is treated with sulfur, it leads to the formation of crosslinks between the polymer chains in rubber.

3. **Formation of Crosslinks**:
- The crosslinking of polymer chains is crucial because it alters the physical properties of rubber. These crosslinks create a network structure that gives the rubber its new characteristics.

4. **Properties of Vulcanized Rubber**:
- After vulcanization, the rubber becomes:
- **Hard**: It gains rigidity and strength.
- **Elastic**: While it becomes harder, it retains elasticity, meaning it can stretch and return to its original shape.
- **Resistant to Temperature Changes**: Vulcanized rubber can withstand a wider range of temperatures without losing its properties.

5. **Evaluating the Options**:
- The question provides options: soft, elastic, resistant to temperature changes, hard, and inelastic.
- **Soft**: Incorrect, as vulcanized rubber is not soft.
- **Elastic**: Correct, but needs to be considered with other properties.
- **Resistant to Temperature Changes**: Correct.
- **Hard**: Correct.
- **Inelastic**: Incorrect, as vulcanized rubber is elastic.

6. **Conclusion**:
- The best description of vulcanized rubber is that it is **hard, elastic, and resistant to temperature changes**. Therefore, the correct answer is that vulcanization makes rubber hard and elastic while also providing resistance to temperature changes.