Polymers that soften on heating and harden on cooling are:
AThermoneutral
BThermoplastic
CThermosetting
DThermostable
Answer & Solution
Correct answer: B. Thermoplastic
1. Such polymers can be reshaped again and again.
2. Polythenes behave this way.
3. They are thermoplastic polymers.
_Source: NCERT Class 12 Chemistry Part II, Chapter 15, Polymers._
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