Which of the following is a difference between thermoplastic and thermosetting plastics?
A
Thermoplastics can be processed repeatedly
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B
Thermosetting plastics can not be softened by heating
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C
Thermoplastics do not undergo chemical change on heating
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D
All the above
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Solution
The correct option is D
All the above
Thermoplastic recyclable is that they can easily be reheated and remolded for new purposes.
Thermosetting plastic has primary bonds between molecular chains and is held together by strong cross-links, so, can not soften easily.
Now, thermoplastics have low melting points and low tensile strength, so, on heating these plastics there have possibilities of chemical changes on heating.
Hence, the three options (A),(B), and (C) are the correct statements.
Conclusion: So, the right option is (D): All of the above.