Class 8 Exam > Class 8 Questions > Which of these is a thermosetting plastic?a)P...
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Which of these is a thermosetting plastic?
- a)Polystyrene
- b)Polythene
- c)Bakelite
- d)PVC
Correct answer is option 'C'. Can you explain this answer?
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Which of these is a thermosetting plastic?a)Polystyreneb)Polythenec)Ba...
To identify the thermosetting plastic among the given options, we need to understand the characteristics of thermosetting plastics. Thermosetting plastics are a type of polymer that undergoes a chemical reaction during molding and hardens irreversibly. They cannot be melted or reshaped once they have been set.
Among the options provided, the thermosetting plastic is:
Bakelite (Option C)
Explanation:
- Bakelite is a thermosetting plastic that was one of the first synthetic plastics invented.
- It is formed by the condensation polymerization of phenol and formaldehyde.
- Once it is molded and hardened, it cannot be softened or reshaped by heat.
- Bakelite is known for its high heat resistance, electrical insulation properties, and durability.
- It is commonly used in electrical switches, handles, and various industrial applications.
Other options:
- Polystyrene (Option A) is a thermoplastic, which means it can be melted and reshaped multiple times.
- Polythene (Option B) is also a thermoplastic commonly known as polyethylene.
- PVC (Option D) is a thermoplastic polymer that can be softened and reshaped by heat.
Therefore, the correct answer is C: Bakelite
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Which of these is a thermosetting plastic?a)Polystyreneb)Polythenec)Bakelited)PVCCorrect answer is option 'C'. Can you explain this answer?
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