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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.
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
Q8.Arrange the following polymers in increasing order of their intermolecular forces:
Ans: Neoprene<Polyvinyl chloride<Nylon-6
Q9.Is (-NH-CHR-Co-)n is a homopolymer or 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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