NCERT Solutions for Class 12 Chemistry Chemistry Part-2 Chapter 15

Polymers Class 12

Chapter 15 Polymers Exercise Solutions

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In text : Solutions of Questions on Page Number : 428

Q1 :  

What are polymers?


Answer :

Polymers are high molecular mass macromolecules, which consist of repeating structural units derived from monomers. Polymers have a high molecular mass (103 - 107 u). In a polymer, various monomer units are joined by strong covalent bonds. These polymers can be natural as well as synthetic. Polythene, rubber, and nylon 6, 6 are examples of polymers.

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Q2 :  

How are polymers classified on the basis of structure?


Answer :

Polymers are classified on the basis of structure as follows:

1. Linear polymers:

These polymers are formed of long straight chains. They can be depicted as:

For e.g., high density polythene (HDP), polyvinyl chloride, etc.

2. Branched chain polymers:

These polymers are basically linear chain polymers with some branches. These polymers are represented as:

For e.g., low density polythene (LDP), amylopectin, etc.

3. Cross-linked or Network polymers:

These polymers have many cross-linking bonds that give rise to a network-like structure. These polymers contain bi-functional and tri-functional monomers and strong covalent bonds between various linear polymer chains. Examples of such polymers include bakelite and melmac.

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Q3 :  

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


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Q4 :  

Write the names of monomers of the following polymers:


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Q5 :  

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


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Q6 :  

Explain the difference between Buna-N and Buna-S.


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Q7 :  

Arrange the following polymers in increasing order of their intermolecular forces.

(i) Nylon 6, 6, Buna-S, Polythene.

(ii) Nylon 6, Neoprene, Polyvinyl chloride.


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Exercise : Solutions of Questions on Page Number : 437

Q1 :  

Explain the terms polymer and monomer.


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Q2 :  

What are natural and synthetic polymers? Give two examples of each type.


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Q3 :  

Distinguish between the terms homopolymer and copolymer and give an example of each.


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Q4 :  

How do you explain the functionality of a monomer?


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Q5 :  

Define the term polymerisation.


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Q6 :  

Is , a homopolymer or copolymer?


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Q7 :  

In which classes, the polymers are classified on the basis of molecular forces?


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Q8 :  

How can you differentiate between addition and condensation polymerisation?


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Q9 :  

Explain the term copolymerisation and give two examples.


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Q10 :  

Write the free radical mechanism for the polymerisation of ethene.


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Q11 :  

Define thermoplastics and thermosetting polymers with two examples of each.


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Q12 :  

Write the monomers used for getting the following polymers.

(i) Polyvinyl chloride (ii) Teflon (iii) Bakelite


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Q13 :  

Write the name and structure of one of the common initiators used in free

radical addition polymerisation.


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Q14 :  

How does the presence of double bonds in rubber molecules influence their

structure and reactivity?


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Q15 :  

Discuss the main purpose of vulcanisation of rubber.


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Q16 :  

What are the monomeric repeating units of Nylon-6 and Nylon-6, 6?


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Q17 :  

Write the names and structures of the monomers of the following polymers:

(i) Buna-S (ii) Buna-N

(iii) Dacron (iv) Neoprene


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Q18 :  

Identify the monomer in the following polymeric structures.

(i)

(ii)


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Q19 :  

How is dacron obtained from ethylene glycol and terephthalic acid?


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Q20 :  

What is a biodegradable polymer? Give an example of a biodegradable aliphatic polyester.


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Chemistry Part-2 - Chemistry : CBSE NCERT Exercise Solutions for Class 12th for Polymers will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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