The process involving heating of rubber with sulphur is called:

Options

A. Sulphonation
B. Vulcanisation
C. Bessemerisation
D. Galvanisation

Answer

To solve the question regarding the process involving the heating of rubber with sulfur, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Process**: The process of heating rubber with sulfur is a well-known chemical reaction that enhances the properties of rubber. This process is essential for improving the performance of natural rubber.

**Hint**: Think about how certain processes can change the properties of materials.

2. **Identifying the Name of the Process**: The specific name for the process of heating rubber with sulfur is called "vulcanization." This term is widely used in chemistry and materials science.

**Hint**: Recall any terms associated with rubber processing that might involve heat and chemical reactions.

3. **Explaining Vulcanization**: During vulcanization, sulfur atoms form cross-links between the long chains of rubber molecules. This results in a stronger and more elastic material compared to untreated rubber.

**Hint**: Consider what happens at a molecular level when two substances are heated together.

4. **Temperature Range**: The vulcanization process typically occurs at a temperature range of 373 Kelvin to 415 Kelvin. This specific temperature range is crucial for the reaction to take place effectively.

**Hint**: Remember that temperature can significantly influence chemical reactions.

5. **Final Properties**: The end result of vulcanization is rubber that has improved elasticity and hardness, making it suitable for various applications, such as tires and seals.

**Hint**: Think about the practical applications of rubber and how its properties might need to be enhanced.

### Conclusion:
The process involving heating rubber with sulfur is called **vulcanization**. This process enhances the rubber's properties, making it more durable and elastic.