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Q.

Which of the following is not a thermosetting plastic?

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a

Bakelite

b

Melamine

c

Polyester

d

PVC

answer is D.

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Detailed Solution

Thermosetting plastic is a polymer that irreversibly becomes rigid when heated. 

For example- Melamine, Polyester, Bakelite etc.

PVC (Polyvinyl chloride) is a polymer that becomes soft when heated.

Hence, PVC is not thermosetting plastic, it is a thermoplastic.

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