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प्रश्न
State whether bakelite is a thermoplastic or a thermosetting plastic. Give reasons for your answer.
कारण बताइए
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उत्तर
- Bakelite is a thermosetting plastic.
- It is formed by condensation polymerization of phenol with formaldehyde, producing a heavily cross‑linked three‑dimensional network.
- Once cured, it cannot be melted or reshaped; heating causes charring or decomposition instead of softening.
- It is hard, brittle, heat-resistant, and insoluble, typical thermoset properties, so the material is permanently set.
- I checked your uploaded files but found no content about Bakelite to cite.
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अध्याय 15: Polymers - REVIEW exercises [पृष्ठ १०१३]
