Q1. The synthetic fibre is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups. Another synthetic fibre C is made up of polymer D which consists of a number of glucose units joined one after the other. a. Which fibre could be terylene, rayon, nylon?

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Solution

Fibre A- Nylon
Fibre B- Terylene
Fibre C- Rayon
Polymer D- Cellulose
Nylon are synthetic polymers specially of aliphatic or semi-aromatic polyamides. Terylene is a synthetic polyester fibre or fibre of terephthalic acid. Rayon is made up of cellulose especially from wood pulp. Cellulose is long chain of linked sugar molecules.

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The synthetic fibre which contains the organic group similar to those which give fruits their 'sweet smell' is :

(a) nylon (b) acrylic (c) terylene (d) rayon

Q. Are these statements true or false? Rewrite the false ones correctly.
(a) Polymers are small molecules made by stringing together several monomers.
(b) Blended fabrics contain only synthetic fibres.
(c) Dusters made of nylon or other synthetic materials are good for use in the kitchen.
(d) Polyester fibres are obtained from petroleum products.
(e) Terylene, a synthetic fibre, can be used instead of wool.
(f) Rayon, which is obtained from cellulose, is a natural fibre.

Rayon, a synthetic fibre is made from:

Fill in the blanks.

(i) A polymer is a chain of many small units joined together which are called

(ii) The synthetic fibres are also known as fibres.

(iii) The first fully synthetic fibre was .

(iv) A fibre similar to wool is .

(v) A plastic used for making crockery is .

Q. Nylon is a synthetic fibre.

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