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Polymers Test - 68

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Polymers Test - 68
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  • Question 1
    1 / -0
    Which of the following is an example of condensation polymers.
    Solution
    Condensation polymers are any kind of polymers formed through a condensation reaction, where molecules join together and lose small molecules as by-products such as water or methanol.
    Polyethylene is made by the addition polymerization of ethylene (olefin) monomers.
    Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer.
    Orlon is a polymer of vinyl cyanide. It is made by the addition of acrylonitrile molecules.
    Terylene is a synthetic polyester fiber produced by polymerizing ethylene glycol and terephthalic acid with the removal of water.
    Hence, option DD is the answer.
  • Question 2
    1 / -0
    Which of the following is a branched polymer?
    Solution
    Low density polythene has highly branched structure. Where as high density polythene, polyester and nylon are linear polymers.

    Hence, option AA is the answer.
  • Question 3
    1 / -0
    A condensation polymer among the following polymers is:
    Solution
    Condensation polymers are any kind of polymers formed through a condensation reaction, where molecules join together and losing small molecules as by-products such as water or methanol.

    Polyvinyl chloride (PVC) is formed by the addition of vinyl chloride molecules. 
    Teflon is an addition polymer of tetrafluoroethylene.
    Dacron is prepared by polycondensation reaction in which terephthalic acid is heated up with ethylene glycol at 425 – 475 K.  
    Polystyrene is formed via the polymerization of styrene which is a petroleum-based, liquid hydrocarbon monomer.

    Hence, option CC is the answer. Dacron is a condensation polymer.

  • Question 4
    1 / -0
    Which of the following is a chain growth polymer?
    Solution
    Chain growth polymer is also known as  addition polymer. A chain-growth polymer is a polymer that is formed when molecules of the same monomer or different monomers add together on a large scale to form the polymer. 
    Among given polymers, polypropylene is a chain-growth polymer and the monomer is propene.
    Nylon-6, Dacron, and Glyptal are formed from step-growth polymerization.
    Hence, the answer is option DD.
  • Question 5
    1 / -0
    Which of the following is not an example of additional polymer?
    Solution
    An addition polymer is a polymer that forms by simple linking of monomers without the co-generation of other products. Addition polymerization sometimes called chain-growth polymerization.
    Ethylene glycol and terephthalic acid are monomers that on polymerization give terylene with water as a byproduct. Hence, not an addition polymer.

    Polypropylene is produced via chain-growth polymerization from the monomer propylene.

    Polyethylene is the addition product of ethylene.

    Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene.

    Hence, option AA is the answer.

  • Question 6
    1 / -0
    An example of chain growth polymer is.
    Solution
    Chain growth polymer is also known as addition polymer. A chain-growth polymer is a polymer that is formed when molecules of the same monomer or different monomers add together on a large scale to form the polymer. 

    Out of the given polymers, Teflon is a chain-growth polymer as the molecules of tetrafluoroethylene (monomer) simply add together to form the polymer.
    Hence, option DD is the answer.
  • Question 7
    1 / -0
    Which is a naturally occuring polymer?
    Solution
    Polyethylene or polythene is the most common plastic which is an addition product of ethylene. So, not a natural polymer.
    Polyvinyl chloride (PVC) is the synthetic plastic polymer, formed by addition of vinyl chloride molecules. 
    Acetic acid is a liquid organic compound with the chemical formula CH3COOHCH_3COOH which is not a polymer.
    Proteins are polymers made out of amino acids. They are made by animals, plants, bugs, fungi, and other living things. A protein is actually a polyamide. Hence, they are naturally occurring polymer.

    Hence, option DD is correct.
  • Question 8
    1 / -0
    Nylon is not a:
    Solution
    Nylon is a type of condensation polymer called a polyamide. Polyamides are created by reacting to a type of monomer called a dicarboxylic acid together with another monomer called a diamine. Hence,  AA and BB are true.

    A copolymer is a polymer derived from more than one species of monomer. 
    Hence, Nylon is a copolymer.
    A homopolymer is a polymer where every monomer unit (mer) of the chain is the same.

    Hence, the answer is option DD.
  • Question 9
    1 / -0
    Bakelite is a polymer of 
    Solution
    Bakelite is obtained from phenol by reacting with formaldehyde HCHO.\text{phenol by reacting with formaldehyde HCHO.} It is step growth branched thermosetting co-polymer of phenol and formaldehyde.
  • Question 10
    1 / -0
    The mass average molecular mass & number average molecular mass of a polymer are respectively 40,000 and 30,000. The polydispersity index of polymer will be:
    Solution
    Polydispersity Index (PDI) is the ratio of the mass average molecular mass to the number average molecular mass.

    Therefore, 
    PDI=4000030000=1.33  > 1PDI= \dfrac{40000}{30000}=1.33\ \ >\ 1

    Hence, option BB is correct.
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