CBSE Class 12 Chemistry Polymer Questions Answers

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Polymer

Q1.Give the name and structure of reagent used for initiating a free radical chain reaction .

Ans: Name- benzoylperoxide ,C₆H₅-CO-O-O-CO-H₅C₆

Q2.Classify them as addition and condensation polymers:Nylon-66,Buna-s,polythene,terylene

Ans: Additionpolymer:Polythene and Buna-s, Condensationpolymer:Nylon-66,terylene

Q3.Give name and structure of monomer present in natural rubber.

Ans:Name:Isoprene(2-Methyl1,3-Butadiene),Structure:CH₂=C(CH₃)CH=CH₂

Q4.What is biodegradeable polymers? Give one example

Ans:polymers which can be degraded naturally. PHBV

Q5.What is polymers?

Ans:Polymers are high molecular mass substances consisting of large no of repeating structural units.

Q6.How are the polymer classified on the basis of structure:

Ans:a) Linear Polymer b)Branched chain polymers c)Cross linked polymers

Q7Writes the names of monomer of the following (-CO-(CH₂)₅-NH-)n

Ans: Caprolactum

Q8.Arrange the following polymers in increasing order of their intermolecular forces:

Nylon6,Neoprene,polyvinyl chloride.

Ans: Neoprene

Q9.Is (-NH-CHR-Co-)n is a homopolymer or copolymer?

Ans: Copolymer

Q10.What is vulcanized rubber?

Ans:process of heating a mixture of natural rubber with sulphur is called vulcanized rubber.

Q11.Write the monomer of Bakelite.

Ans: Phenol - formaldehyde

Q12.Mention two uses of Bakelite.

Ans: It is used for making combs,electrical switches and handle of various utensils

Q13Explain the term copolymer and give two examples.

Ans: Polymer which are made up of two different monomer unit are called copolymers: eg.Buna-N,Buna-S

Q14.Mention one use of melamine?

Ans: It is used in the manufacture of unbreakable crockery.

Q15.How can natural rubber be made tougher?

Ans: By the process of vulcanization with sulphur.

Q16.What is natural rubber?

Ans: It is a cis 1,4-polyisoprene. 

Q17.How do you explain functionality of monomer?

AnS:No of bonding sites in monomers.

Q18.What are natural polymers?

Ans:Those polymers which are obtained mostly from plants and animals are called natural polymers eg Natural rubber,cellulose

Q19.What is synthetic polymers?

Ans:Those polymer which are obtained from chemical compound are called synthetic polymer

Q20.What is monomer of Nylon-2-Nylon-6?

Ans: Glycine,6-Aminocaproic acid.

(Two marks questions on polymer)

Q1.Explain the difference between Buna-N and Buna-s.

Ans: Buna-N is a polymer of 1,3-Butadiene and acrylonitrile and buna-s is a polymer of 1,3-Butadiene and styrene.

Q2.Distinguish between homopolymer and copolymer?

Ans:Homopolymer is made up of only one type of monomer unit eg. PVC. Where as co-polymer is made up of two different monomer units eg Buna-s. 

Q3.What are polyamides and polyesters?Give one example of each.

Ans: Polymers having amide linkage in the chain are called polyamides e.g Nylon-6. Polymers having ester linkage in the chain are called polyesters e.g. Terylene.

Q4 Dicuss the main purpose of vulcanization.

Ans: Natural rubberbecome soft at high temperature,Brittle at low temperature.And show higher water absorption capacity. It is nonresistant to attack by oxidizing agent .In order to improve these properties a process of vulcanization is carried out.

Q5.In which classes, the polymers are classified on the basis of molecular forces?

Ans: Elastomer, fibre ,thermoplastics and thermosetting polymers.

Q6. Write names of monomers of the following polymers. a)(-CF2-CF2-)n   b)(CH2-CH(cl)-)n. 

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