(c) Cross linked or Network polymers: Those are formed from bifunctional and tri-functional monomers and contain strong covalent bonds between various linear polymer chains e.g, bakelite and melamine. Polymers Class 12 Chemistry MCQs Pdf. The winner will be announced in early spring. We have also provided with a List of Polymers and their monomers that are prescribed on the NCERT Book of Class 12. The word polymer has a Greek origin. Epoxy resins are used In making adhesives such as araldite, etc. It is determined by osmotic pressure method. For the sake of the candidates we are providing Class 12 Mock Test / Practice links below. The growth of the polymer chain depends upon the availability of the monomers in the reaction. These are called biopolymers, e.g., polysaccharides, proteins, nucleic acids, etc. polystyrene. These linear chains are closely packed in space. Aliphatic polyesters are the common examples of biodegradable Polymers. It is manufactured from rubber latex which is a colloidal suspension of rubber in water. For more important questions on subject topics like polymers and more, register with BYJU’S. The word polymer has a Greek origin. Polymers Class 12 Important Questions. (a) Natural polymers: Proteins, cellulose, starch, resins and rubber. This means that they are biodegradable. So, go ahead and check the Important Notes for Class 12 Chemistry Polymers. 8. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. CBSE Sample Papers 2021 for Class 12 – Urdu (Elective), CBSE Sample Papers 2021 for Class 12 – Urdu (Core), CBSE Notes Class 12 Sociology Change and Development in Industrial Society. Candidates can also check out the Key Points, Important Questions & Practice Papers for various Subjects for Class 12 in both Hindi and English language form the link below. Plastics or polymers are integral part of our daily life. 6. These weak binding forces permit the polymer to be stretched. It involves the following steps: (iii) Anionic polymerisation It involves formation of a carbanion, Steps involved in this process are. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Addition polymers can further be classified on the basis of the typesof monomers into the following two classes: Homopolymers The polymers which are obtained by the polymerisation of a single type of monomer are called homopolymers. is known as polymerisation. Polymer chemistry is a sub-discipline of chemistry that focuses on the chemical synthesis, structure, and chemical and physical properties of polymers and macromolecules.The principles and methods used within polymer chemistry are also applicable through a wide range of other chemistry sub-disciplines like organic chemistry, analytical chemistry, and physical chemistry. Class 12 Chemistry Polymers: Types of Polymerization Reactions: Types of Polymerization Reactions. Natural rubber is soft and sticky. It is a copolymer formed by the polymerisation of melamine (which is a heterocyclic triamine) and formaldehyde as follows : It is very hard and tough. Class XII Chapter 15 – Polymers Chemistry Question 15.1: Explain the terms polymer and monomer. The manufacture of nylon-6 involves condensation of (a) Phenol and formaldehyde This process of introducing -S-S- crosslnks in the structure of natural rubber by heating with sulphur at 11O°C is called vulcanlsation of rubber. Polymerisation is carried out at 420 to 460 K in the presence of catalyst mixture of zinc acetate and antimony trioxide. big size molecules, they are also called macromolecules Syllabus. Plus. Step I Initiation Strong bases act as initiator. We have provided Polymers Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. e.g., high density polyethene, nylon and polyesters are linear polymers. (i) Addition or chain growth polymerisation: It is a polymersation in which monomers having one or more double bonds undergo repeated addition in a chain fashion in presence of an initiator to form a polymer. Before appearing in the main examination, candidates must try mock test as it helps the students learn from their mistakes. Question from very important topics is covered by Exemplar Questions for Class 12. Classification of Polymers Based on Molecular Forces, 1. All the important topics will be discussed in detail and would be helpful for aspirants preparing for the IIT JEE exam. Some important example of linear polymers are high density polythene, nylon, polyesters etc. Polymer is defined as a chemical substance of a high molecular mass formed by the combination of a large number of simple molecules, called monomers. which means many units (parts). As a result, it can be stretched by the application of a force. Some common examples of such polymers are low density polyethene, starch, glycogen etc. These are also known as macromolecules. It has assumed great importance these days particularly in making crockery. Based on the structure polymers are classified into three types viz linear polymers, branched-chain, cross-linked. Class 12 chemistry chapter 15 Introduction to polymer chemistry solutions May 25, 2020 Maharashtra state Chemistry Textbook Solutions for Class 12 are very important and crusial that helps the students in understanding the complex topics and helps them in the preparation of class 12 board examination as well as verious compititive entrance examinations also. Hope these notes helped you in your schools exam preparation. It is used in bristles for brushes and in textile. (c) Thermoplastics. The process of heating a mixture of raw rubber and sulphur at 373 K to 415 K is known as vulcanisation of rubber. It is a natural polyamide fibre. Copolymers The polymers which are obtained by the polymerisation of two or more monomers are called copolymers. The most commonly used catalysts are benzoyl peroxide, hydrogen peroxide or t-butyl peroxide etc. Polymers have a high molecular mass (10 3 − 10 7 u). (b) Branched chain polymers: They contain linear chains having some branches, e.g., low density polyethene. There are two broad types of polymerisation reaction: Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. 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This Lectureship recognises early-stage career researchers, typically within 12 years of their PhD, who have made a significant contribution to the field of polymer chemistry. It is also chemically inert and more tougher and harder. Depending upon the nature of the reactive species involved. NCERT Solutions for Class 12 Chemistry Chapter 15 Polymers. Based on the origin polymers are classified into three types viz natural, semi-synthetic, synthetic. Download CBSE Class 12 Chemistry Polymer Questions Answers pdf, Chemistry revision notes, mind maps, formulas, examination notes, sure shot questions, CBSE Class 12 Chemistry Polymer Questions Answers. Addition polymers have the same empirical formula as their monomers. The concepts should be clear which will help in faster learning. C:\Chemistry-12\Unit-15.pmd 28.02.07 elastomeric polymers, the polymer chains are held together by the weakest intermolecular forces. 1. In Polymers Class 12 NCERT PDF students will learn about the different classes of Polymers and … Condensation polymerisation which occurs in a stepwise manner with elimination of some smaller molecules like H2O, NH3, HCI, ROH, etc., is concerned with step growth polymerisation, e.g., adipic acid and hexamethylenediamine phenol and formaldehyde etc., undergo step Growth Polymerisation. As polymers are single, giant molecules i.e. Class 12 Chemistry Polymers: Introduction: Introduction. With the help of Class 12 Mock Test / Practice, candidates can also get an idea about the pattern and marking scheme of that examination. Our NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers are user friendly and have been created by a team of Science experts. Its fibres are quite strong and durable. Class 12 Chemistry Polymers – Get here the Notes for Class 12 Polymers. It is a copolymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid. Thus, the polymer sample contains chain of varying lengths and hence, its molecular mass is always expressed as an average molecular mass. Get here NCERT Solutions for Class 12 Chemistry Chapter 15.These NCERT Solutions for Class 12 of Chemistry subject includes detailed answers of all the questions in Chapter 15 – Polymers provided in NCERT Book which is prescribed for class 12 in schools. The process of vulcanisation is accelerated by additing additives such as ZnO. Learners at any stage of their preparations will be benefited from the course. It is a chapter which is purely conceptual with a lot of emphasis in theory. For example, styrene and methacrylate form a copolymer. Complete Course on Polymer Chemistry for Class 12 & Droppers Mohammad Kashif Alam. In this unit, we will discuss chapter polymers class 12 of Chemistry.Here we have given detailed notes on Polymers, Classification of Polymers for the students, especially of Class 12. Starch, cellulose, and rubber all possess polymeric properties. are called natural polymers. Here we have covered Important Questions on Polymers for Class 12 Chemistry subject. Get subscription. (a) Elastomers CBSE 2019 Class 12th Exam is approaching and candidates will have to make the best use of the time available towards the last stage of your CBSE Class 12th Chemistry Preparation. The addition polymers formed by the repeated addition of ethene is ____. Free download Polymers Class 12 Chemistry Important Questions .Ribblu launches platform for supplying free download of CBSE Sample board exam papers & worksheets from nursery to class 12th Candidates who are ambitious to qualify the Class 12 with good score can check this article for Notes. Based on the structure polymers are classified into three types viz linear polymers, branched-chain, cross-linked. At higher temperature, it becomes soft and at low temperature, it becomes brittle. It has moderate tensile strength but good tearing strength. #Polymers #PradeepSharma #Chemistry Lets under stand the class 12th chapter polymer , Part-1, in this video. Exemplar Questions Class 12 is a very important resource for students preparing for the Examination. It is used for the manufacturing conveyers belts, gasket and hoses. Answer: Polymers are high molecular mass macromolecules, which consist of repeating structural units derived from monomers. Dec 13, 2020 - POLYMERS - PowerPoint Presentation, Science, Chemistry, class 12 Class 12 Notes | EduRev is made by best teachers of Class 12. It is obtained by the condensation of adipic acid and hexamethylenediamine with the elimination of water molecule. Classification based on molecular forces: NCERT Solutions for Class 12 Chemistry Chapter 6 – Polymers. Chemistry. In the polymer chain of natural rubber, the residual double bonds are located between C2 and C3 of the isoprene unit. Oct 31, 2020 - POLYMERS -Class Notes, Chemistry, Class 12, CBSE, NCERT Class 12 Notes | EduRev is made by best teachers of Class 12. Get Revision Notes on natural and synthetic rubber, buna-s, buna-n, bakelite, dacron, nylon-6 & nylon-6,6 by askIITians. It can be used only in the temperature range 10°C-50°C. Step III Chain termination step There are three ways of chain termination: Coupling reaction, disproportionation reaction, chain transfer reaction. Polymers Class 12 2. Soft bakelites with low degree of polymerisation are used as binding glue for laminated wooden plants, in varnishes and lacquers. These numbers refer to the number of carbon atoms in diamine and in the dibasic acid. Huge List of CBSE Chemistry Projects for Class 12, Chemistry Science Fair Projects Free Download, Models, Experiments, Winning CBSE Chemistry Science Experiments,cool and fun interesting investigatory project for chemistry for Kids and also for Middle school, Elementary School for class 5th Grade,6th,7th,8th,9th 10th,11th, 12th Grade and High School , MSC and College Students. Answer: c Explaination: (c) C 6 H 5 —CH=CH 2 is monomer of polystyrene. Nature has provided us a variety of polymers which can be produced by the biological systems in plants and animals. A polymer is a large molecule of high molecular mass formed by the repetitive bonding of many small molecules called monomers. And check the important topics will be benefited from the course for every student to get full marks Chemistry... Nylon, polypropylene, polyvinyl chloride polymerisation and encourages you to identify the applications of the main exam the of! 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