Question

Consider the following statements.

1. Bakelite and Melamine are an example of thermoplastics.

2. Thermoplastics are used for making electrical switches, floor tiles, etc.

Which among the above is/are correct?

1. 1 only 
2. 2 only 
3. Both 1 and 2
4. Neither 1 nor 2

Answer 1

Correct Answer - Option 4 : Neither 1 nor 2

The correct answer is Neither 1 nor 2.

• Such plastic which gets deformed easily on heating and can be bent easily is known as thermoplastic. 
  • It can be cooled and heated several times without any change in its chemical or mechanical properties.
  • These are used for manufacturing toys, combs, and various types of containers.
  • Examples of thermoplastics- Polythene and PVC.
• Such plastic which when molded once, can not be softened by heating is known as thermosetting plastic.
  • They have primary bonds between molecular chains and held together by strong cross-links.
  • Examples of thermosetting plastic- Bakelite and Melamine. (statement 1 is incorrect)
    • Bakelite is a poor conductor of heat and electricity. It is used for making electrical switches, handles of various utensils, etc.
    • Melamine is a versatile material. It resists fire and can tolerate heat better than other plastics. It is used for making floor tiles, kitchenware and fabrics which resist fire. (statement 2 is incorrect)