Tag: processing of fibres

Questions Related to processing of fibres

Which of the following is not an example of natural polymer?

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Wool

  2. Silk

  3. Leather

  4. Nylon

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Correct Option: D
Explanation:

Natural polymers occur in nature and can be extracted. 


Examples of naturally occurring polymers are silk, wool, leather, DNA, cellulose and proteins. 


Synthetic polymers are human-made polymers.

Examples of synthetic polymers include nylon, polyethene, polyester, Teflon, and epoxy. 

Hence, option D is the correct option.

______ and ______ yields wool found in South America.

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Goat and Sheep

  2. Angora Goat

  3. Llama and Alpaca

  4. Yak and Sheep

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Correct Option: C
Explanation:

Llama and Alpaca species found in South America yield wool.

The acrylic polymer must contain :

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. acrylonitrile monomer.

  2. sodium thiocyanate.

  3. acrylic acid.

  4. sulphuric acid.

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Correct Option: A
Explanation:

Acrylic fibers are synthetic fibers made from a polymer (polyacrylonitrile) with an average molecular weight of approx 100,000, about 1900 monomer units. 


For a fiber to be called acrylic, the polymer must contain at least 85% acrylonitrile monomer. Acrylonitrile is an organic compound that is a colorless volatile liquid.

So, the correct option is $A$

State True or False.


Teflon is natural polymer.

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. True

  2. False

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Correct Option: B
Explanation:

There are two types of polymers: synthetic and natural. 


Synthetic polymers are derived from petroleum oil and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethene, polyester, Teflon, and epoxy. 

Natural polymers occur in nature and can be extracted. They are often water-based. Examples of naturally occurring polymers are silk, natural rubber, wool, DNA, cellulose and proteins.

Hence, it is a false statement.

Which of the following is not a synthetic polymer?

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Polyisoprene

  2. Polybutadiene

  3. Polyethylene terephathalate

  4. Polyethylene

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Correct Option: A
Explanation:

Polyisoprene is a natural polymer made of isoprene as the monomeric unit.

Acetate rayon is prepared from _____.

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Acetic acid

  2. Glycerol

  3. Starch

  4. Cellulose

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Correct Option: D
Explanation:

Acetate rayon is a organic polymer formed by acetylation of all remaining -OH's of linear cellulose chain. It is a synthetic filament, yarn, or fabric composed of a derivative of the acetic ester of cellulose.

Which of the following is not a synthetic polymer?

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. polyvinyl chloride

  2. plastic

  3. polystyrene

  4. polyethylene

  5. cellulose

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Correct Option: E
Explanation:

Cellulose is not a synthetic polymer. It is a natural polymer.
It is a polysacchardie having molecular formula $(C _6H _{10}O _5) _n$. It has linear chain of $\beta(1\rightarrow 4)$ linked D-glucose units. There are several hundred to many thousands of such units in a chain.  Cellulose is an important structural component of  in the primary cell wall of green plants, many forms of algae and the oomycetes.