{"id":10031,"date":"2019-12-05T14:32:57","date_gmt":"2019-12-05T09:02:57","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=10031"},"modified":"2021-07-02T15:43:56","modified_gmt":"2021-07-02T10:13:56","slug":"2nd-puc-chemistry-question-bank-chapter-15","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/2nd-puc-chemistry-question-bank-chapter-15\/","title":{"rendered":"2nd PUC Chemistry Question Bank Chapter 15 Polymers"},"content":{"rendered":"

You can Download Chapter 15 Polymers Questions and Answers, Notes, 2nd PUC Chemistry Question Bank with Answers<\/a> Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations.<\/p>\n

Karnataka 2nd PUC Chemistry Question Bank Chapter 15 Polymers<\/h2>\n

2nd PUC Chemistry Polymers NCERT Textbook Questions<\/h3>\n

Question 1.
\nExplain the terms polymer and monomer.
\nAnswer:
\nPolymers are high molecular mass of macromolecules composed of repeating structural units derived from monomers. Polymers have a high molecular mass (103<\/sup>-107<\/sup>u). In a polymer, various monomer units are joined by strong covalent bonds. Polymers can be natural as well as synthetic. Polythene, rubber and nylon 6,6 are examples of polymers.<\/p>\n

Monomers are simple, reactive molecules that combine with each other in large numbers through covalent bonds to give rise to polymers. For example ethene, propene, styrene, vinyl chloride.<\/p>\n

Question 2.
\nWhat are natural and synthetic polymers? Give two examples of each type.
\nAnswer:
\nNatural polymers are polymers that are found in nature. They are formed by plants and animals. Examples include protein, cellulose, starch etc.<\/p>\n

Synthetic polymers are polymers made by human beings Examples include plastic (polythene), synthetic fibers (nylon 6, 6), synthetic rubbers (Buna-S).<\/p>\n

\"KSEEB<\/p>\n

Question 3.
\nDistinguish between the terms homopolymer and copolymer and give an example of each.
\nAnswer:<\/p>\n\n\n\n\n
Homopolymer<\/strong><\/td>\nCopolymer<\/strong><\/td>\n<\/tr>\n
The polymers that are formed by the polymer\u00adization of a single monomer are known as homopolymer. In other words, the repeating units of homopolymers are derived only from one monomer. For example, polythene is a homopolymer of ethane.<\/td>\nThe polymers whose repeating units are derived from two types of monomers are known as copolymers. For example, Buna-S is a copolymer of 1, 3 – butadiene and stryrene.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 4.
\nHow do you explain the functionality of a monomer?
\nAnswer:
\nThe functionality of a monomer is the number of binding sites that is\/are present in that monomer.
\nFor example, the functionality of monomers such as ethene and propene is one and that of 1, 3-butadiene and adipic acid is two.<\/p>\n

Question 5.
\nDefine the term polymerisation.
\nAnswer:
\nPolymerisation is the process of forming high molecular mass (103<\/sup>-107<\/sup>u) macromolecules, which consist of repeating structural units derived from monomers. In a polymer, various monomer units are joined by strong covalent bonds.<\/p>\n

Question 6.
\nIs ( NH-CHR-CO )8<\/sub>, a homopolymer or copolymer?
\nAnswer:
\n(NH CHR-CO)8<\/sub> is a homopolymer because it is obtained from a single monomer unit, NH2<\/sub>-CHR-COOH.<\/p>\n

Question 7.
\nIn which classes, the polymers are classified on the basis of molecular forces?
\nAnswer:
\nOn the basis of magnitude of intermolecular forces present in polymers, they are classified into the following groups:<\/p>\n

    \n
  • Elastomers<\/li>\n
  • Fibers<\/li>\n
  • Thermoplastic polymers<\/li>\n
  • Thermosetting polymers<\/li>\n<\/ul>\n

    Question 8.
    \nHow can you differentiate between addition and condensation polymerisation?
    \nAnswer:
    \nAddition polymerisation is the process of repeated addition of monomers, possessing double or triple bonds to form polymers. For example, polythene is formed by addition polymerization of ethene<\/p>\n

    \"2nd
    \nCondensation polymerization is the process Of formation of polymers by repeated condensation reactions between two different bi functional or tri functional monomers. A small molecule such as water or hydrochloric acid is eliminated in each condensation. For example nylon 6, 6 is formed by condensation polymerisation of hexamethylene diamine and adipic acid.<\/p>\n

    \"2nd<\/p>\n

    \"KSEEB<\/p>\n

    Question 9.
    \nExplain the term copolymerisation and give two examples.
    \nAnswer:
    \nFormation of polymers from two or more different monomeric units is called copolymerization. Multiple units of each monomer are present in a copolymer. The process of forming polymer BunaS from 1, 3-butadiene and styrene is an example of copolymerization.<\/p>\n

    \"2nd
    \nNylon 6,6 is also a copolymer formed by hexamethylene diamine and adipic acid.<\/p>\n

    \"2nd<\/p>\n

    Question 10.
    \nWrite the free radical mechanism for the polymerisation of ethene.
    \nAnswer:
    \nPolymerization of ethene to polythene consists of heating or exposing to a light mixture of ethene with a small amount of benzoyl peroxide as the initiator. The reaction involved in this process is given below:
    \n\"2nd
    \n\"2nd<\/p>\n

    Question 11.
    \nDefine thermoplastics and thermosetting polymers with two examples of each.
    \nAnswer:
    \nThermoplastics polymers are linear (slightly branched) long chain polymers, which can be repeatedly softened and hardened on heating. Hence, they can be modified again and again. Examples include polyethene, polystyrene.<\/p>\n

    Thermosetting polymers are cross-linked or heavily branded polymers which get hardened during moulding process. These plastics cannot be softened again on heating. Examples of thermosetting plastics include bakelite, urea-formaldelyde resins.<\/p>\n

    Question 12.
    \nWrite the monomers used for getting the following polymers.
    \n1. Polyvinyl chloride
    \n2. Teflon
    \n3. Bakelite
    \nAnswer:
    \n1. Vinyl chloride (CH2<\/sub> = CHCI)
    \n2. Tetrafluro ethylene (CF2<\/sub> = CF2<\/sub>)
    \n3. Formaldehyde (HCHO) and phenol (C6<\/sub>H5<\/sub>OH)<\/p>\n

    \"KSEEB<\/p>\n

    Question 13.
    \nWrite the name and structure of one of the common initiators used in free radical addition polymerisation.
    \nAnswer:
    \nOne common initiator used in tree radical addition polymerization is benzoyl peroxide. Its structure is given below.<\/p>\n

    \"2nd<\/p>\n

    Question 14.
    \nHow does the presence of double bonds in rubber molecules influence their structure and reactivity?
    \nAnswer:
    \nNatural rubber is a linear cis-polyisoprene in which the double bonds are present C2<\/sub> and C3<\/sub> of the isoprene units.
    \n\"2nd
    \nBecause of this cis — configuration, inter molecular interactions between the various standard of isoprene are quite weak. As a result, various strands in natural rubber are arranged randomly. Hence it shows elasticity.<\/p>\n

    Question 15.
    \nDiscuss the main purpose of vulcanisation of rubber.
    \nAnswer:
    \nNatural rubber though useful has some problems associated with its use. These limitations are discussed below;<\/p>\n

      \n
    • Natural rubber is quite soft and sticky at room temperature. At elevated temperatures (>335K), if becomes even softer. At low temperature (<283K) it becomes brittle. Thus to maintain its elasticity, natural rubber is generally used in the temperature range of 283K-335K.<\/li>\n
    • It has the capacity to absorb large amounts of water.<\/li>\n
    • It has low tensile strength and low resistance to abrasion.<\/li>\n
    • It is soluble in non polar solvents<\/li>\n
    • It is easily attacked by oxidizing agents
      \nVulcanisation of natural rubber is done to improve all these properties. In this process, a mixture of raw rubber with sulphur and appropriate additive is heated at a temperature range between 373K and 415K.<\/li>\n<\/ul>\n

      Question 16.
      \nWhat are the monomeric repeating units of Nylon-6 and Nylon-6,6?
      \nAnswer:
      \nThe monomeric repeating unit of nylon 6 is [NH – (CH2<\/sub>)5<\/sub> – CO], which is derived form caprolactum.<\/p>\n

      The monomeric repeating unit of nylon 6, 6 is [NH – (CH2<\/sub>)6<\/sub> – NH – CO – (CH2<\/sub>)4<\/sub> – CO], which is derived from hexamethylene diamine and adipic acid.<\/p>\n

      Question 17.
      \nWrite the names and structures of the monomers of the following polymers:
      \n(i) Buna-S
      \n(ii) Buna-N
      \n(iii) Dacron
      \n(iv) Neoprene
      \nAnswer:
      \n\"2nd<\/p>\n

      \"KSEEB<\/p>\n

      Question 18.
      \nIdentify the monomer in the following polymeric structures.<\/p>\n

      \"2nd
      \nAnswer:
      \nMonomers are:<\/p>\n

      \"2nd<\/p>\n

      Question 19.
      \nHow is dacron obtained from ethylene glycol and terephthalic acid ?
      \nAnswer:
      \nThe condensation polymerisation of ethylene glycol and terephthalic acid leads to the formation dacron.<\/p>\n

      \"2nd<\/p>\n

      Question 20.
      \nWhat is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.
      \nAnswer:
      \nA polymer that can be decomposed by bacteria is called a biodegradable polymer. Poly – \u03b2- hydroxybutyrate – Co -\u03b2 – hydroxyvalerate (PHBV) is a biodegradable aliphatic polyester.<\/p>\n

      \"2nd<\/p>\n

      2nd PUC Polymers Additional Questions<\/h3>\n

      Question 1.
      \nHow are polymers classified on the basis of solution?
      \nAnswer:<\/p>\n

        \n
      • Linear polymers such as high density polythene (HDP), Polyvinyl chloride, nylons, polyester etc.<\/li>\n
      • Branched polymers such as low density polythene (LDP), amylopectin, glycogen etc.<\/li>\n<\/ul>\n

        Question 2.
        \nWhat is the difference between Buna-S and Buna-N ?
        \nAnswer:
        \nBoth are copolymers basically Buna-N is a copolymer of
        \n1,3- butadiene and acrylonitrile. Buna-S is a copolymer of
        \n1,3- butadiene and styrene.<\/p>\n

        Question 3.
        \nWhat are the monomeric units of Nylon 6 and Nylon 6, 6?
        \nAnswer:
        \nMonomeric repeating unit of Nylon 6 :
        \n\"2nd
        \nwhich is derived from caprolactam monomeric repeating unit of Nylon 6,6 :
        \n\"2nd
        \nwhich is derived from 2 monomers, hexamethylenediamine and adipic acid and has the following structure.<\/p>\n

        Question 4.
        \nWhat are the disadvantages of natural rubber which are compromised by vulcanisation ?
        \nAnswer:<\/p>\n

          \n
        • It becomes more soft and sticky at high temperatures and brittle at low temperatures.<\/li>\n
        • It. has large water absorption capacity and low tensile strength and low resistance to abrasion.<\/li>\n
        • Not resistant to action of organic solvents.<\/li>\n
        • Easily attacked by oxygen and other oxidising agents.<\/li>\n<\/ul>\n

          \"KSEEB<\/p>\n

          Question 5.
          \nWhat does PMMA stand for?
          \nAnswer:
          \nPoly(methyl methacrylate)<\/p>\n

          Question 6.
          \nHow are polymers classified on the basis of molecular forces?
          \nAnswer:<\/p>\n

            \n
          • Elastomers<\/li>\n
          • Fibres<\/li>\n
          • Thermoplastic<\/li>\n
          • Thermosetting.<\/li>\n<\/ul>\n

            Question 7.
            \nWhat is copolymerisation (and give an example)?
            \nAnswer:
            \nWhen 2 or more different monomers are allowed to polymerise together, product is called copolymer and process is called copolymerisation.
            \nEx: Buna-S: 1, 3 – butadiene and styrene.<\/p>\n

            Question 8.
            \nWhat thermoplastic and thermosetting polymers ?
            \nAnswer:
            \nThermoplastics are linear polymers which can be repeatedly softened on heating and hardened on cooling and hence can.be repeatedly used.
            \nex: polythene, polypropene etc.<\/p>\n

            Thermosetting polymers are on the other hand permanently setting polymers. On heating, they harden and cant be softened again.
            \nex: bakelite, urea-formaldehyde resin.<\/p>\n

            Question 9.
            \nWhat is functionality of a polymer?
            \nAnswer:
            \nIt is the number of bonding sites in a molecule.
            \nFunctionality of styrene is one, whereas it is for adipic acid.<\/p>\n

            Question 10.
            \nWrite free radical mechanism for polymerisation of ethene.
            \nAnswer:
            \nInitiation:
            \n\"2nd<\/p>\n

            \"KSEEB<\/p>\n","protected":false},"excerpt":{"rendered":"

            You can Download Chapter 15 Polymers Questions and Answers, Notes, 2nd PUC Chemistry Question Bank with Answers Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations. Karnataka 2nd PUC Chemistry Question Bank Chapter 15 Polymers 2nd PUC Chemistry Polymers NCERT Textbook Questions Question 1. Explain the terms …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[82],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/10031"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=10031"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/10031\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=10031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=10031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=10031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}