Tag: polymers

Questions Related to polymers

Which of the followings may reduce plastic pollution?

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Stop using bottled water

  2. Bring your own reusable grocery bags with you when you go to the store

  3. Use a refillable dispenser for your hand soap and dish washing liquid, one large bottle is better than using a bunch of small ones

  4. Both A and B

Show answer
Correct Option: A,B,C
Explanation:

We can help to reduce plastic pollution by minimizing the use of plastic and we can do it by stop using bottled water, by bring our own reusable grocery bags when go to the store and by using  a refillable dispenser for your hand soap and dish washing liquid, one large bottle is better than using a bunch of small ones. 

Food and personal product manufacturers, retailers and consumers need to be aware of the benefits of plastics packaging and the need to dispose plastics in a manner which leads to increasing emphasis on recycling. Everyone must understand that the environmental legacy we leave behind for future generations will depend on our resolve to : $REDUCE - REUSE - RECYCLE$.


Which are the keys initiatives by which we can reduce plastic pollution?

allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

  1. Reusing our plastic bags or utensils

  2. Recycling what we have already used

  3. Reducing the unnecessary use of plastic

  4. All of these

Show answer
Correct Option: D
Explanation:

To reduce plastic pollution $3R's$ are used.

$1.$ Reduce.
$2.$ Reuse
$3.$ Recycle
To reduce means to avoid uses of plastic in our daily life.
To reuse means to uses plastic materials, again and again, to avoid their wastage and to recycle means to recycle the already existing plastic in order to avoid the formation of any new plastic.

Formation of nylons and polyesters are called step growth polymerization because:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. the polymers are formed by adding a monomer step by step

  2. the polymers are formed by condensation and monomers are joined by loss of simple molecules like water

  3. the monomers used for condensation are unsaturated molecules

  4. the polymers are formed by addition of a large number of free radicals formed by monomers

Show answer
Correct Option: B
Explanation:
 These polycondensation reactions result in the loss of some simple molecules as water, alcohol, etc., and lead to the formation of high molecular mass condensation polymers.
let's look at the formation of nylon polymer
Nylon 6,6- It is prepared by the condensation polymerisation of hexamethylenediamine with adipic acid under high pressure and at high temperature with the removal of water molecules.
the correct option is [B].

Terylene is a condensation polymer of ethylene glycol and:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. benzoic acid

  2. phthalic acid

  3. terephthalic acid

  4. salicylic acid

Show answer
Correct Option: C
Explanation:

Terylene is a condensation polymer of ethylene glycol and terephthalic acid,

it is the product of condensation polymerisation, this type of polymerisation generally involves a repetitive condensation reaction between two bi-functional monomers and lead to the formation of high molecular mass condensation polymers.
The correct option is [C].

Which of the following is not true about polymers?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Polymers are high molecular mass macro-molecules.

  2. Polymers may be of natural or synthetic origin.

  3. Condensation polymers are made up of one type of monomers only.

  4. They have high viscosity and do not carry any charge.

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Correct Option: C
Explanation:

A) Polymers are high molecular mass macro-molecules made with a large number of repeating subunits.

B) Naturally occurring polymers - Silk, Wool, DNA, etc.
Synthetic polymers- Nylon, Polyethylene, Polyester etc. 
C) Two bi-functional monomers are used in condensation polymerisation,
Example Nylon-6,6 is the polymer of Hexamethylenediamine + adipic acid

So this statement is false.

D) Polymers are large chain molecules so they have high viscosity. Since monomers of polymers are neutral, the overall polymer is also neutral.

$X-(CH _2) _4-X \xrightarrow [{HOOC-(CH _2) _4-COOH}] {Y}:Condensation : Polymer$


The correct functional group $X$ and the reagent/reaction conditions $Y$ in the following scheme are:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. $X=COOCH _{3},\ Y=H _{2}/Ni/heat$

  2. $X=CONH _{2},\ Y=H _{2}/Ni/heat$

  3. $X=CONH _{2},\ Y=Br _{2}/NaOH$

  4. $X=CN,\ Y=H _{2}/Ni/heat$

Show answer
Correct Option: C,D

 Which of the following is condensation polymer? 

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Polypropylene

  2. PMMA

  3. Glyptal

  4. Teflon

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Correct Option: A

Synthetic fiber does not obtained from renewable resources is : 

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Nylon

  2. Polyester

  3. Rayon

  4. Acrylic

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Correct Option: C
Explanation:

Synthetic fibres are manufactured using plant materials and minerals. 


Viscose comes from pine trees or petrochemicals, while acrylic, nylon and polyester come from oil and coal. 

Viscose fibre is obtained from the cellulose; versatility allows imitating materials such as cotton or silk.

Rayon is a manufactured fiber made from natural sources such as wood and agricultural products that are regenerated as cellulose fiber. 

The many types and grades of rayon can imitate the feel and texture of natural fibers such as silk, wool, cotton, and linen.

Therefore, option C is correct.

Regenerated fibres have superior physical properties because

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. they are fresh fibres

  2. they are obtained naturally

  3. they are chemically treated fibres

  4. None of the abvoe

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Correct Option: C
Explanation:

Regenerated fibre is created by dissolving the cellulose area of plant fibre in chemicals and making it into fibre  again.It consists of cellulose like cotton and hemp  so it is called as regenerated cellulose fibre.

Bakelite is formed by:

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. polymerization of phenol and formaldehyde

  2. polymerization of alcohol and acetaldehyde

  3. condensation of phenol and formaldehyde

  4. condensation of phenol and acetaldehyde

Show answer
Correct Option: C
Explanation:

Bakelite is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde.


Hence, option C is correct.