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Which of the following polymers are thermoplastic in nature?

1. Teflon
2. Natural rubber
3. Neoprene
4. Polystyrene

Correct answer: Polystyrene

Solution

Thermoplastic polymers have linear or slightly branched chains and can be repeatedly softened and reshaped by heating. Polystyrene is a thermoplastic. Teflon (PTFE) is also thermoplastic, but natural rubber and neoprene are elastomers with cross-linked structures. If only one answer is expected, Polystyrene is the standard textbook example of a thermoplastic among these options.

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