On the basis of molecular forces, polymer can be classified as -

1. Elastomers

2. Fibres

3. Thermoplastic polymers 

4. All of the above

 Monomers of Dacron polymer is: 

1. Ethylene glycol and terephthalic acid

2. Ethylene oxide and  phthalic acid

3. Ethylene glycol and benzoic acid

4. Benzamide and terephthalic acid

The purpose of vulcanization of rubber is/are -

1. To maintain the elasticity of natural rubber.

2. To improve the tensile strength of natural rubber.

3. To use for a wide range of temperatures.

4. All of the above.

The term copolymerization means formation of polymer from : 

1. The same monomer.

2. Two or more different monomers.

3. Acid and base.

4. Elastomer.

The salient feature of biodegradable polymer is:

1. Polymer that can be decomposed.

2. Polymer that cannot be decomposed.

3. Polymer that can be denatured.

4. Polymer that cannot be denatured.

The examples of thermoplastics and thermosetting polymers are respectively :

The difference between Buna-N and Buna-S is :

Classify the polymers into addition and condensation polymers: Terylene, Bakelite, Polyvinyl chloride, Polythene. 

Increasing order of intermolecular forces for Nylon - 6, 6, Buna-S, Polythene is-

1. Buna-S > Polythene > Nylon- 6,6

2. Buna-S < Polythene < Nylon- 6,6

3. Buna-S < Nylon- 6,6 < Polythene

4. Nylon-6,6 < Buna-S < Polythene

The presence of double bonds in rubber molecules increase -

1. Viscosity 

2. Elasticity

3. Surface Tension

4. Vapour pressure