Rayon is  a

Which of the following is a branched polymer?

Natural rubber is a polymer of

Which of the following is biodegradable polymer of polyamide class?

Which of the following statements is not true about low density polythene?

What are polymers ?

Can enzyme be called a polymer ?

.......... is obtained by polymerization of .............. and is used for making non-stick utensils.

Nylon 6 is obtained by polymerization of..............

Draw the structures of the monomers of the following polymers :
(i) Bakelite
(ii) Nylon-6

Write the free radical mechanism for the polymerisation of ethene.

Classify the following as addition and condensation polymers : Terylene, Bakelite, Polyvinyl chloride, polythene.

What is the repeating unit in the condensation polymer obtained by combining HO₂CCH₂CH₂COOH (succinic acid) and H₂NCH₂CH₂NH₂ (ethylenediamine).

What are high and low density polythenes?

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

Write the (i) structure and (ii) one use of each of the following polymers:
(a) PVC
(b) Urea-formaldehyde resin
(c) Bakelite

Why should one always use purest monomer' in free radical polymerisation ?

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?

Polymers are giant molecules having very high molecular masses. Several of them occur in nature and find a variety of applications in our daily life and industry. Cellulose, starch, proteins, rubber etc. are some examples of natural polymers. Now answer the following questions:
(i)Does use of natural polymer cause pollution problems?
(ii) Name an inorganic natural polymer which is quite abundant in nature.
(iii) Name three polymers which are used in textile industry.
(iv) In what form is natural rubber usually used in rubber industry?