JAMB Chemistry 2019 Objective — Question 10

Question 10 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

Plastics which lose their plasticity on being subjected to heat are said to be

A. biodegradable
B. polymeric
C. thermosets
D. thermoplasticsCorrect

Explanation

Plastics that lose their plasticity when heated are thermosets; those that do NOT lose plasticity (and can be reheated/remoulded) are thermoplastics. Thermoplastics can be heated and remoulded repeatedly, while thermosets cannot be reshaped once set.

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