Rayon is  a

Which of the following is not a thermoplastic?

Which of the following polymers can be used for lubrication and as an insulator?

Which polymers occur naturally?

Which of the following are addition homopolymers?

What is the repeating structural unit in polythene polymer ?

Can enzyme be called a polymer ?

Nylon 6,10 is obtained by condensation polymerization of ......... with.........

Write the monomer units of bakelite.

Name the sub-groups into which polymers are classified on the basis of magnitude of intermolecular forces.

How does the presence of double bonds in rubber molecules influence their structure and reactivity ?

Define thermoplastics.

Give one example each of 
(i) addition polymers
(ii) condensation polymers

What is vulcanization?Discuss its main purpose.

What are biodegradable polymers ? Give an example of such a polymer and mention its uses.

Explain the following terms giving a suitable example for each :
(i) Elastomers
(ii) Condensation polymers
(iii) Addition polymers

Write chemical equations for the synthesis of 
(a) terylene
(b) neoprene
(c) teflon

Write the names and structures of the monomers of the following polymers:
(i) Bakelite
(ii) Nylon-6
(iii) Polyethene

Which of the following polymers soften on heating and harden on cooling? What are the polymers with this property collectively called? What are the structural similarities between such polymers Bakelite, urea-formaldehyde resin, polythene, polyvinyl, polystyrene.

After the ban on plastic bags, students of a school decided to make people aware of the harmful effects of plastic bags on the environment and Yamuna River. To make the awareness more impactful, they organised a rally by partnering with other schools and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All the students pledged not to use polythene bags in the future to save the Yamuna River.
After reading the above passage, answer the following questions:
(i) What values are shown by the students?
(ii) What are bio-degradable polymers ? Give one example.
(iii) Is polyethene a condensation or an addition polymer?

Formaldehyde is a constituent of a number of polymers also called resins. These are non-volatile solids or semi-solids which are obtained from certain plants and also be synthesized in the laboratory.
(i) Name the main formaldehyde resins.
(ii) Mention the major components of these resins also called polymers.
(iii) Which out of these is useful in the manufacture of crockery?
(iv) Formaldehyde is obtained from plants. Similarly we obtain many useful things from plants. Is it worth to destroy plants for obtaining useful material ?