Vulcacnised rubber resists:

Options

A. Wear and tear due ot friction
B. Cryogenic temperature
C. High Temperature
D. Action of acids

Answer

**Step-by-step Solution:**

1. **Understanding Vulcanization**:
- Vulcanization is a chemical process that involves treating rubber with sulfur. This process enhances the properties of rubber, making it more durable and elastic. Sulfur atoms act as linkers between the chains of monomer units in rubber.

2. **Analyzing the Properties of Vulcanized Rubber**:
- **Wear and Tear Due to Friction**:
- Vulcanized rubber is designed to resist wear and tear. The process of vulcanization increases its tensile strength, hardness, and viscosity, allowing it to withstand friction and the heat generated from it.
- **Fragility at Cryogenic Temperatures**:
- At extremely low temperatures (cryogenic temperatures), vulcanized rubber loses its elasticity and can become brittle. It does not resist these temperatures well and can freeze at around -150°C.
- **Resistance to High Temperatures**:
- Vulcanized rubber can withstand temperatures in the range of 140°C to 160°C. Beyond this range, it begins to degrade and does not resist high temperatures effectively.
- **Action of Acids**:
- Vulcanized rubber is resistant to various acids, including sulfuric acid and nitric acid. This means it does not get affected by the action of acids.

3. **Conclusion**:
- Based on the analysis, vulcanized rubber is particularly resistant to wear and tear due to friction and the action of acids. However, it is not resistant to cryogenic temperatures or high temperatures beyond its threshold.

4. **Final Answer**:
- The correct option for the question "Vulcanized rubber resists:" is **wear and tear due to friction**.

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