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Polymer MCQs are given in this article along with answers and detailed explanations. Class 12 Chemistry Chapter 15 Polymers MCQs will help the students better grasp the concept of polymers and prepare well for the board examination. Polymers are the macromolecules that are formed by joining a large number of small monomers in a chain. These monomers chemically react to form long molecules. Polymers can be classified as either amorphous or crystalline. Crystalline polymers are semicrystalline as the measured densities for the perfect materials differ from those obtained for these polymers.
Ques 1. A substance that is formed of multiple repeating units of _______ is known as a polymer.
- Mers
- Plastic
- Resins
- Blocks
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Answer: a) Mers
Explanation: Polymer is a substance that is formed of multiple repeating units called mers. Polymers are formed of large molecules known as macromolecules that are connected together to form long chains.
Ques 2. Bakelite is an example of _______.
- elastomer
- fibre
- thermoplastic
- thermosetting
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Answer: d) thermosetting
Explanation: Bakelite is a thermosetting polymer that is also a phenol-formaldehyde polymer.
Ques 3. A polymer with an amide linkage is known as:
- nylon-6,6
- teflon
- Terylene
- Bakelite
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Answer: a) nylon-6,6
Explanation: Polyamides such as Nylon 6 and Nylon 6-6 have amide linkage. Nylon 6, 6 is used to form bristles for brushes, in making sheets, and in the textile industry.
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Ques 4. Which of the following is not a stage of addition polymerization?
- Initiation
- Propagation
- Recrystallisation
- Termination
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Answer: c) Recrystallisation
Explanation: The addition polymerization process is used to join similar monomers together in order to form long-chain molecules. It is also known as chain reaction polymerization. Initiation, propagation, and termination are all parts of the additional polymerization process.
Ques 5. Out of the following polymers, which one does not involve cross-linkages?
- Vulcanized Rubber
- Polythene
- Melamine
- Bakelite
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Answer: b) Polythene
Explanation: Cross-linked polymers are formed from bi and trifunctional monomers and have strong covalent bonds between different linear polymer chains. For instance, melamine, vulcanized rubber, and bakelite.
Polythene, on the other hand, is a linear polymer formed of monomer ethene. Therefore, it does not involve cross linkages.
Ques 6. On the basis of the mode of formation, polymers can be classified as:
- as addition and condensation polymers
- as copolymers
- as addition polymers only
- as condensation polymers only
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Answer: a) as addition and condensation polymers
Explanation: On the basis of their mode of formation, the polymers are of two types - addition and condensation polymers.
Addition polymers are formed by chain-growth polymerization whereas condensation polymers are formed by combining two monomers through the elimination of a small molecule such as methyl alcohol or water.
Ques 7. A high molecular weight molecule that is built of a large number of small molecules is known as a _______.
- monomer
- polymer
- isomer
- tautomer
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Answer: b) polymer
Explanation: A large molecule formed of multiple repeated monomers is known as a polymer. They play an important role in our everyday life due to their properties. The process by which they are formed is known as polymerization.
Ques 8. Terylene is a condensation polymer formed through the combination of ethylene glycol and
- benzoic acid
- phthalic acid
- dimethyl terephthalate
- salicylic acid
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Answer: c) dimethyl terephthalate
Explanation: Terylene is the condensation polymers formed of monomers - ethylene glycol and terephthalic acid.
Ques 9. Which of the following is not an example of thermoplastic?
- Polyvinyl chloride
- Nylon
- Epoxy
- Polyesters
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Answer: c) Epoxy
Explanation: Thermoplastics include nylon, polyesters, and polyvinyl chloride. Therefore, epoxy is not a thermoplastic material.
Ques 10. Which of the following is not a natural polymer?
- RNA
- Cellulose
- Rayon
- Starch
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Answer: c) Rayon
Explanation: Natural polymers are polymers that are derived from plants and animals such as RNA, Starch, and Cellulose. Rayon, on the other hand, is a semi-synthetic polymer that is formed by altering a natural polymer. It is produced by the acetylation of cellulose with acetic anhydride in sulphuric acid.
Ques 11. The polymer expands after absorbing __________.
- Methanol
- Water
- Ethyl Alcohol
- Ether
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Answer: b) Water
Explanation: The polymer expands after soaking up the water. The polymer then slowly dissolves into the viscous, heterogeneous polymer solution.
Ques 12. For which plastics can the process of heat softening, molding, and cooling to rigidness be repeated?
- thermosetting plastics
- thermoplastics
- both (a) and (b)
- neither (a) nor (b)
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Answer: b) thermoplastics
Explanation: A thermoplastic is a plastic polymer material that can be molded at a certain elevated temperature and then becomes rigid upon cooling.
Thermosetting plastics however can not be remolded or reused.
Ques 12. Polymer formation from the monomer starts by
- the condensation reaction between monomers
- the coordinate reaction between monomers
- hydrolysis of monomers
- conversion of monomer to monomer ions by protons
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Answer: a. the condensation reaction between monomers
Explanation: Polymerisation reactions start with the addition reactions between monomers. Condensation polymers are formed through the combination of monomers by eliminating simple molecules. The addition polymers are formed by the addition of the molecules of the monomer to form a large molecule.
Read More: polypropylene
Ques 13. Dacron is an example of:
- polyesters
- Polyamides
- polyacrylonitrile
- Polypropenes
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Answer: a) polyesters
Explanation: Dacron is formed by heating a mixture of terephthalic acid and ethylene glycol. It is an example of polyesters.
Ques 14. Teflon and neoprene are examples of
- Copolymers
- Homopolymers
- Homopolymers and Monomers
- Condensation polymers
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Answer: c) Monomers and Homopolymers
Explanation: Teflon is a homopolymer of monomeric units of tetra-fluoro-ethene while Neoprene is a homopolymer of monomeric units of chloroprene.
Ques 15. The synthetic polymer prepared by using caprolactam is known as
- Nylon 6
- Terylene
- teflon
- nylon 6
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Answer: d) nylon 6
Explanation: Nylon-6 is the synthetic polymer prepared with the use of caprolactam. It is formed by heating caprolactam with water at a high temperature.
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