Tag: processing of fibres

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

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

  1. Wool

  2. Silk

  3. Leather

  4. Nylon
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The acrylic polymer must contain :

  1. acrylonitrile monomer.

  2. sodium thiocyanate.

  3. acrylic acid.

  4. sulphuric acid.
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $A$

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

State True or False.


Teflon is natural polymer.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which of the following is not a synthetic polymer?

  1. polyvinyl chloride

  2. plastic

  3. polystyrene

  4. polyethylene

  5. cellulose
Reveal answer Fill a bubble to check yourself
E Correct answer
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.