Problem 42 - Arihant Objective Approach to Organic Chemistry for IIT JEE and NEET all Medical Entrances Part 4

Question

Which of the following statements is correct regarding the drawbacks of raw rubber? (a) It is elastic in nature (b) It has large water-absorption capacity (c) It has little durability (d) All of the above

Step-by-Step Solution

Answer

The correct statements are (b) and (c).

Step 1: Understanding the Question

The question is asking us to identify the correct statement or statements regarding the disadvantages of raw rubber. We are given four options, and we need to determine which of these options are accurate descriptions of a drawback of raw rubber.

Step 1: Analyze Option (a)

Consider if being 'elastic in nature' is a drawback of raw rubber. Elasticity typically refers to the ability of a material to return to its original shape after deformation. In general, elasticity is considered a beneficial property, so this is unlikely to be a drawback.

Step 2: Analyze Option (b)

Assess whether 'large water-absorption capacity' is a drawback of raw rubber. A high water-absorption capacity can make a material unsuitable for many applications where water resistance is required, indicating that this could indeed be a drawback.

Step 3: Analyze Option (c)

Investigate if 'little durability' is a drawback of raw rubber. Low durability implies that a material may degrade or wear out quickly, suggesting this is also a possible drawback of raw rubber.

Step 4: Analyze Option (d)

Evaluate option (d) which states 'All of the above.' Since options (b) and (c) are correctly identified as drawbacks, and not all aspects in (a) are drawbacks, 'All of the above' cannot be correct.

Step 6: Final Conclusion

From the analysis, the options that correctly describe drawbacks of raw rubber are (b) and (c). 'Elastic in nature' is not a drawback, so (a) is incorrect, and consequently, (d) is also incorrect as not all the options are drawbacks.

Key Concepts

Elasticity of Materials

Elasticity is a key property of materials that permits them to regain their original shape after being stretched or compressed. When we talk about rubber and other elastic materials, we typically think of items like rubber bands or balloons.
Elasticity is largely advantageous, as it allows materials to absorb shock and distribute energy efficiently, making them ideal for a variety of applications. However, not all materials exhibit the same degree of elasticity. Depending on the structure of the polymer chains, some materials may return to their original shape more readily than others.

• Key property for durability and resilience.
• Beneficial for shock absorption.
• Important for flexible and cushioning applications.

While being elastic is not considered a drawback of raw rubber, different types of elastic behaviors are crucial for designing materials for specific uses.

Water Absorption in Polymers

Water absorption is a critical factor in material science, especially with polymers. The degree to which a polymer absorbs water can greatly influence its mechanical properties and suitability for various applications.
Raw rubber is known for its relatively high water absorption capability. This can be a significant drawback since it can lead to swelling, loss of mechanical strength, or degradation over time.

• High water absorption can lead to reduced effectiveness in waterproof applications.
• Can lead to changes in mechanical properties.
• May cause long-term degradation.

This attribute has to be modified or improved, usually through additives or processing techniques, to make rubber suitable for specific industrial applications.

Durability of Rubber

Durability is essential for materials used in everyday products, as they need to withstand wear and tear over time. Unfortunately, one of the drawbacks of raw rubber is its limited durability.
Raw rubber can degrade quickly when exposed to environmental factors like UV radiation, ozone, and other chemical reactions. This degradation process results in a loss of mechanical integrity and surface cracking.

• Exposed to environmental damage.
• Common issues include brittleness and cracking.
• Enhancements like vulcanization can significantly improve durability.

By addressing these weaknesses, especially through vulcanization processes, the durability of rubber products can be greatly enhanced.

Properties of Polymers

Polymers boast a wide range of properties, enabling their use in countless applications. These properties can be tailored through chemical modifications, providing immense versatility to the field.
Some common properties of polymers include elasticity, toughness, thermal resistance, and varying levels of water absorption. These characteristics stem from their long chains of repeating molecular units, allowing them to be both flexible and durable.

• Wide range of customizable properties.
• Applications include packaging, textiles, and automotive parts.
• Properties can be optimized for specific uses through additives and processes.

Understanding these properties is critical in selecting and designing materials for different industrial and consumer needs, making polymers an indispensable part of modern material science.