In Polymers Class 12 NCERT PDF students will learn about the different classes of Polymers and … 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. These weak binding forces permit the polymer to be stretched. As polymers are single, giant molecules i.e. On the contrary, synthetic polymers generally have PDI > 1 which means that they are less homogeneous. A few ‘crosslinks’ are introduced in between the chains, which help the polymer … Higher the stability of carbocation intermediate, more is the reactivity of monomers towards cationic addition polymerisation. Hindi. For the sake of the candidates we are providing Class 12 Mock Test / Practice links below. It is used in making oil seals, gaskets and also for non-stick surface coated utensils. Depending upon the nature of the reactive species involved. Polymer is defined as a chemical substance of a high molecular mass formed by the combination of a … It is a thermosetting plastic. (b) Semi-synthetic polymers: Cellulose derivatives as cellulose acetate (rayon) and cellulose nitrate, etc. Answer/Explanation. (i) Addition polymers The polymers formed by the polymerisation of monomers containing double or triple bonds (unsaturated compounds) are called addition polymers. It can be used only in the temperature range 10°C-50°C. Polymers class 12 CBSE 1. These are expected to be quite hard, rigid and brittle. The classification of … 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. Chapter 6 – Polymers. (c) Synthetic polymers: Plastic (polythene), synthetic fibres (nylon 6, 6) and synthetic rubbers (Buna-S). IIT JEE. 7. and protonic acids such as H2SO4, HF, etc. A polymer is a large molecule of high molecular mass formed by the repetitive bonding of many small molecules called monomers. Some important example of linear polymers are high density polythene, nylon, polyesters etc. 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 Dynells a copolymer of vinyl chloride and acrylonitrile and is used for making human hair wigs. The topic of this project is "Polymers". 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. Polymers can be classified in number of ways, Classification based on inter molecular forces, Depending on the repetition or variety of monomers, polymers are classified as. It is, therefore, used in the manufacture of paints and lacquers. Polymers Class 12 Chemistry MCQs Pdf. The word polymer has a Greek origin. Digital NCERT Books Class 12 Chemistry pdf are always handy to use when you do not have access to physical copy. Class XII Chapter 15 – Polymers Chemistry Question 15.1: Explain the terms polymer and monomer. One mode of termination of chain is shown as under: (ii) Cationic polymerisation It involves formation of carbocation which are generated by Lewis acids (like BF3, AICI3, SnCI4, etc.) As polymers are single big size molecules, they are also called macromolecules. When the force is removed, the chain returns back to its original coiled shape. The manufacture of nylon-6 involves condensation of (a) Phenol and formaldehyde This document is highly rated by Class 12 students and has been viewed 21769 times. This document is highly rated by Class 12 students and has been viewed 6319 times. Step I Chain initiation step In this step, peroxide undergoes homolytic fission, e.g., benzoyl peroxide on heating produces phenyl initiator free radical. Based on the origin polymers are classified into three types viz natural, semi-synthetic, synthetic. Its fibres are quite strong and durable. Polymerisation is carried out at 420 to 460 K in the presence of catalyst mixture of zinc acetate and antimony trioxide. These substances often form into a chain-like structure. These are the copolymer of epichlorohydrin and bisphenol-A. (ii) Condensation polymers The polymers which are formed by the combination of monomers with the elimination of small molecules such as water, alcohol, hydrogen chloride etc., are known as condensation polymers, e.g., nylon 6,6 is formed by the condensation of hexamethylene diamine with adipic acid. The winner will be announced in early spring. Students who are in Class 12 or preparing for any exam which is based on Class 12 Chemistry can refer NCERT Book for their preparation. which means many units (parts). These polymers are obtained by the condensation reaction of phenol with formaldehyde in the presence of either acid or a base catalyst. We have provided Polymers Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well. Addition or chain growth polymerization. The chapter of Polymers in Chemistry is a great lesson in teaching students about their properties and characteristics. It is used in the insulation of electricity carrying wires and manufacture of queeze bottles, toyes and flexible pipes. 3. It has higb water absorption capacity. Nominations are now open until 31st December. Bakelite is used for making combs, photograph records, electrical switches etc. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Terylene is used in the manufacture of a variety of clothes such as terycot, terywool and terysilk as a result of blending with other yerns. 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. The molecules of the same monomer or different monomers add together on a large scale to form a polymer. Nominations are now open until 31st December. (d) Thermosetting plastics Exemplar Questions Class 12 is a very important resource for students preparing for the Examination. This chapter explains the mechanical properties and applications of polymers. This award is presented annually. It is determined by light scattering and ultracentrifugation method. As polymers are single, giant molecules i.e. The word polymer has a Greek origin. The topic of this project is "Polymers". There are two broad types of polymerisation reaction: These are also known as macromolecules. Students can solve NCERT Class 12 Chemistry Polymers MCQs Pdf with Answers to know their preparation level. Classification of the Polymers:- Classification on the basis of repeating structural unit:-. PREVIEW. It is a condensation product of ethylene glycol and terephthalic acid. That is why we have provided for students of class 12 important questions from the chapter polymers. Classification of Polymers Based on Structure. In these polymers, the monomers are joined together to form long straight chains of polymer molecules. Classification based on mode of polymerisation: 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. Classification of polymers on the basis of source: • The single unit of a polymeric chain is called a monomer. are all made of polymers. Here is an example of the following: Hope these notes helped you in your schools exam preparation. The 15 th chapter of the CBSE Chemistry Class 12 syllabus is Polymers. Polymers have a high molecular mass (10 3 − 10 7 u). a) In chain-reaction polymerization. As such, it cannot be used very extensively for commercial puposes. Students who are in Class 12 or preparing for any exam which is based on Class 12 Chemistry can refer NCERT Book for their preparation. Classification of Polymers Based on Molecular Forces, 1. There are many more useful educational material which the students can download in pdf format and use them for studies. The monomer of polystyrene is (a) C 2 H —CH=CH 2 (b) CH 2 =CHCl (c) C 6 H 5 CH=CH 2 (d) CH 2 =CH—CHO. (c) Thermoplastics. In other words, such polymers are more homogeneous. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. In a polymer, various monomer units are joined by strong covalent bonds. The reaction involves the formation of methylene bridge at ortho, para or both ortho and para positions. Question from very important topics is covered by Exemplar Questions for Class 12. Our NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers are user friendly and have been created by a team of Science experts. are called natural polymers. For this polymerisation monomers used are unsaturated compounds like alkenes; alkadienes and their derivatives. It is a copolymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid. Hello Friends, welcome back to another video! ... Class 12th Chemistry – 14 Biomolecules MCQs. It is used for making containers, house wares, bottles, toyes, electric insulation etc. Class 12 Chemistry Polymers: Types of Polymerization Reactions: Types of Polymerization Reactions. Get subscription. Chain Growth Polymerisation or Addition Polymerisation. At higher temperature, it becomes soft and at low temperature, it becomes brittle. The polyamides are identified by numbers. Natural rubber is cis 1,4-polyisoprene. Plus. The process of heating a mixture of raw rubber and sulphur at 373 K to 415 K is known as vulcanisation of rubber. As a result of branching, these polymers are not closely packed in space. Learn best CBSE & NCERT Solutions for Class 12 Chemistry Polymers. The process by which the monomers get combined and transformed into polymers. It involves the following steps: (iii) Anionic polymerisation It involves formation of a carbanion, Steps involved in this process are. polythene. 9. Polymer formed by polymerisation of chloroprene is neoprene or synthetic rubber. The polymers which contain an amide linkage in chain are known as pOlyamide, e.g., nylon-6, 6. Mock test are the practice test or you can say the blue print of the main exam. Aliphatic polyesters are the common examples of biodegradable Polymers. (i) Natural polymers Those polymers which occur in nature. Answer: Polymers are high molecular mass macromolecules, which consist of repeating structural units derived from monomers. 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. Some examples of synthetic polymers include nylon, polypropylene, polyvinyl chloride. 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. 2. Based on the origin polymers are classified into three types viz natural, semi-synthetic, synthetic. The properties of natural rubber can be modified by introducing -S-S- polysulphide crosslinks in its structure. In this video, I have explained Polymers, unit 15 of class 12 NCERT. Natural rubber is soft and sticky. (b) Fibres In basic terms, a polymer is a long-chain molecule that is composed of a large number of repeating units of identical structure. chemistry viva questions class 12, chemistry viva questions class 11, chemistry projects for class 11 topics ideas, imp 12th chemistry viva questions, Title: Polymer Chemistry PPT Page Link: Polymer Chemistry PPT - Posted By: project girl Created at: Friday 16th of November 2012 07:47:14 PM 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. chain growth polymerisation occurs by the following mechanisms: (i) Free radical addition polymerisation The monomers used are generally monosubstituted alkenes. This chapter explains the terms monomer, polymer and polymerisation and encourages you to identify the applications of the same in daily life. These weak binding forces permit the polymer to be stretched. In the biological system, these polymers decompose or hydrolyse in the Presence of different enzymes. It is used for making toys, radio and TV cabinets. e.g.. Polymers in the natural world have been around since the beginning of time. 1. For natural polymers, PDI is usually equal to one which means that they are monodisperse. Rghv R007. The polymers which contain an ester linkage are known as polyester, e.g., dacron. It is an alternating polyamide copolymer of glycine (H2N-CH2-COOH) and amino caproic acid [H2N(CH2) 5COOH] and is biodegradable. It is also used for preparing magnetic recording tapes, conveyer belts, aprons for industrial workers etc. It has high density due to close packing. Study material like concept maps, important and sure shot Here we have given detailed notes on Polymers, Classification of Polymers for the students, especially of Class 12. 8. The concepts should be clear which will help in faster learning. Vulcanisation introduces polysulphide (-S-S-) bonds between the adjacent chains. Class 12 Chemistry Polymers NCERT solutions are handy for students in many ways. Natural.rubber is a coiled linear 1, 4-polymer of isoprene. The growth of the polymer chain depends upon the availability of the monomers in the reaction. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. Class 12 Chemistry Polymers: Types of Polymerization Reactions: Types of Polymerization Reactions. Complete Course on Polymer Chemistry for Class 12 & Droppers Mohammad Kashif Alam. This award is presented annually. A copolymer contains multiple units of each monomer in the same polymeric chain. In the natural rubber, there is no polar substituent. 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