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Class 10 Chemistry Chapter 26 Polymers Class Test 8 – Full Chapter | Punjab Board 2027
Chemistry Class 10 Board Model Papers 2027
Class 10 Chemistry Chapter 26: Polymers – Class Test 8 is a complete chapter-wise assessment designed for students preparing for the Punjab Board Annual Examinations 2027. This comprehensive test covers the entire Chapter 26, including all topics and textbook exercises, according to the new Class 10 Chemistry syllabus issued by PECTAA Punjab. It provides students with an opportunity to revise important concepts, practise exam-oriented questions, and evaluate their preparation through a complete chapter test. This test is part of the Punjab Board 2027 Model Papers and Chapter-Wise Test Series, developed to support effective examination preparation.
Paper No.8
CHEMISTRY
Chapter
Wise
Wise
Roll No.(in Figures):
(in Words):
NOTE:Four possible answers A, B, C and D to each question are given. The choice which you think is
correct, fill that circle in front of that question with Marker or Pen ink. Cutting or filling two or more circles will result in zero mark in that question.
Q1.12
- 1.Which of the following polymer is a synthetic polymer:(A) Starch(B) Cellulose(C) Animal fat(D) PolyesterAnswer: (D) Polyester
- 2.The process of formation of a polymer from a monomer is called:(A) Condensation(B) Polymerization(C) Hydration(D) EsterificationAnswer: (B) Polymerization
- 3.Which polymer has an amide linkage:(A) Polyester(B) Polyamide(C) Polyethene(D) PolystyreneAnswer: (B) Polyamide
- 4.The reaction in condensation polymerization takes place in presence of:(A) Heat only(B) Light only(C) An acid or a base(D) Water onlyAnswer: (C) An acid or a base
- 5.The structure of the monomer of the following polymer is:[ –CH2–CH OCOCH3 ] n(A) CH2 = CH2(B) CH2 = CH2 – CH3(C) CH2 = CH – OCOCH3(D) CH2 = CH – CO – O – CH3Answer: (C) CH2 = CH – OCOCH3
- 6.There are main types of polymers:(A) One(B) Two(C) Three(D) FourAnswer: (B) Two
- 7.Which of the following polymers can be recycled?(A) PET(B) Polystyrene(C) PVC(D) EpoxyAnswer: (A) PET
- 8.To find monomers from a polyamide, we break the:(A) Ester linkage(B) Amide linkage(C) Glycosidic linkage(D) Peptide linkage onlyAnswer: (B) Amide linkage
- 9.Which of the following polymers is biodegradable?(A) Polyamide(B) Polyester(C) Starch(D) PETAnswer: (C) Starch
- 10.Which synthetic fibers account for 69% of all material used in clothing industry?(A) Nylon and acrylic(B) Rayon and acrylic(C) Polyesters and nylon(D) PVC and polyetheneAnswer: (C) Polyesters and nylon
- 11.Which of the following polymers is obtained by condensation polymerization?(A) Polyvinyl chloride(B) Polystyrene(C) Polyamide(D) PolyetheneAnswer: (C) Polyamide
- 12.Discarded plastic articles can take up to how many years to break down?(A) 10 years(B) 100 years(C) 500 years(D) 1000 yearsAnswer: (D) 1000 years
Chemistry • Paper No. 8 • Chapter 26: Polymers • Objective Type
Here is Subjective Part of the Model Paper.
Roll No.(in Figures):
(in Words):
Q2.Write short answers to any FIVE (5) questions:(5×2=10)
- (i)Give two examples each of addition polymers and condensation polymers.Addition polymers: polyethene, polyvinyl chloride (PVC). Condensation polymers: nylon (polyamide), polyester (PET).
- (ii)What are polymers?Polymers are very large molecules (macromolecules) made by joining a large number of small repeating units, called monomers, through covalent bonds. Examples: polyethene, starch, proteins.
- (iii)How polymers are useful for us?Polymers are used for clothing (nylon, polyester), packaging, bottles, pipes, cables, furniture, toys and medical items. Natural polymers such as starch and proteins are our food and form our body tissues.
- (iv)What are condensation polymers?Condensation polymers are formed when monomers having two functional groups join together with the loss of a small molecule such as H2O or HCl. Examples: nylon and polyester.
- (v)How synthetic fibers are different from natural fibers?Synthetic fibers (nylon, polyester) are made from petrochemicals; they are strong, durable, wrinkle-resistant, quick-drying and cheap, but non-biodegradable. Natural fibers (cotton, wool, silk) come from plants or animals, absorb sweat better and are biodegradable.
- (vi)How can PET be recycled?Used PET bottles are collected, sorted, washed and shredded into flakes. The flakes are melted and either spun into fibers or moulded into new bottles and other products.
- (vii)Are natural polymers hazardous for the environment?No. Natural polymers (starch, cellulose, proteins) are biodegradable; bacteria and fungi break them down into simple harmless substances.
- (viii)How does an ester linkage form between two monomers?The –COOH group of one monomer reacts with the –OH group of another monomer, and a molecule of water is removed. This forms the ester linkage –CO–O–.
Q3.Write short answers to any FIVE (5) questions:(5×2=10)
- (i)Draw the structures of the following polymers. (a) Polypropylene (b) Polystyrene(a) Polypropylene and (b) Polystyrene:[–CH2–CHCH3]n [–CH2–CHC6H5]n
- (ii)How do you find the monomer from an addition polymer?Remove the brackets and “n” from the repeating unit and put a double bond between the two carbon atoms of the main chain. Example: [–CH2–CH2–]n → CH2=CH2.
- (iii)Why is it dangerous to burn discarded articles made of plastics?Burning plastics releases poisonous gases and smoke (CO, HCl from PVC, dioxins). These pollute the air, cause breathing problems and cancer, and add to global warming.
- (iv)What properties make plastics widely used?Plastics are light, strong, durable, cheap, waterproof, corrosion-resistant, easily moulded into any shape, and are good insulators of heat and electricity.
- (v)How are synthetic fibers different from natural fibers?Synthetic fibers are man-made from petrochemicals, are stronger, durable and quick-drying but not biodegradable. Natural fibers (cotton, wool, silk) are obtained from plants and animals and are biodegradable.
- (vi)Why is it not advisable to dump discarded synthetic articles in oceans?Synthetic articles do not decompose. They pollute water, harm or kill marine animals that swallow them or get trapped in them, and break into microplastics that enter the food chain.
- (vii)Why are natural polymers not hazardous for the environment?Natural polymers are biodegradable. Microorganisms break them down into simple substances, so they do not accumulate in the environment.
- (viii)What is polyethene?Polyethene is an addition polymer made from ethene (CH2=CH2): [–CH2–CH2–]n. It is used to make bags, bottles, films and pipes.
Q4.Write short answers to any FIVE (5) questions:(5×2=10)
- (i)What is the role of catalyst in addition polymerization?The catalyst (initiator) starts the reaction by producing reactive species that attack the double bond of a monomer and begin chain growth. It also speeds up the polymerization.
- (ii)What is the importance of polyesters and nylon in clothing industry?Polyesters and nylon are strong, light, durable, wrinkle-resistant, quick-drying and cheap. They make up about 69% of the material used in the clothing industry.
- (iii)What are the adverse effects of plastics on the environment?Plastics are non-biodegradable and pile up on land and in water, block drains, harm animals and marine life, and release toxic gases when burnt.
- (iv)
Deduce the monomer from the following addition polymers. (a) [–CH2–CHCl]n (b) [–CH2–CHCN]n(a) CH2=CHCl (vinyl chloride). (b) CH2=CH–CN (acrylonitrile).
- (v)What is the abbrevation of PET?PET stands for Polyethylene terephthalate.
- (vi)How can we address the environmental challenges caused by plastics?By reducing the use of plastics, reusing and recycling them, using biodegradable alternatives, collecting waste properly, not burning plastics, and spreading awareness.
- (vii)What are the environmental challenges caused by plastics?Land and water pollution, danger to marine life, microplastics in the food chain, toxic fumes on burning, blocked drains, and very long decomposition time (up to 1000 years).
- (viii)How are polymers being 3D printed?A polymer filament (such as PLA or ABS) is melted and deposited layer by layer through a nozzle following a digital design. Each layer cools and hardens to form the final object.
(PART – II)
Note: Attempt any TWO questions.(2 × 9 = 18)
Q5.(a)How is PET formed? Can you recycle this polymer?5
(b)Describe polymers of plastic and their uses.4
Formation: PET is a polyester formed by condensation polymerization of ethylene glycol and terephthalic acid. The –OH groups of the glycol react with the –COOH groups of the acid, losing water and forming ester linkages.
n HOOC–C6H4–COOH + n HO–CH2–CH2–OH → [–OC–C6H4–COO–CH2–CH2–O–]n + 2n H2O
Recycling: Yes, PET can be recycled. Bottles are collected, sorted, washed, shredded into flakes, melted and made into new bottles, fibers for clothing, or other products.
- Polyethene: bags, bottles, films, pipes.
- PVC: pipes, cables, flooring.
- Polystyrene: packaging, cups, insulation.
- Polypropylene: containers, ropes, carpets.
- PET: drink bottles and fibers.
Q6.(a)Differentiate between addition and condensation polymerizations.5
(b)Describe the effects of synthetic polymers on the environment.4
| Addition polymerization | Condensation polymerization |
|---|---|
| Monomers contain a double bond. | Monomers contain two functional groups. |
| No by-product is formed. | A small molecule (H2O, HCl) is lost. |
| Needs a catalyst (initiator). | Occurs in presence of an acid or a base. |
| Polymer has the same formula as monomers. | Polymer formula differs from the monomers. |
| Examples: polyethene, PVC, polystyrene. | Examples: nylon, polyester. |
- They are non-biodegradable and can take up to 1000 years to break down.
- They accumulate on land, block drains and spoil soil.
- They pollute oceans and harm marine life; microplastics enter the food chain.
- Burning gives off toxic gases and smoke that pollute the air.
Q7.(a)Write down reactions alongwith the conditions to prepare polyamide and polyester.5
(b)Describe the effects of synthetic polymers on the environment.4
Polyamide (nylon-6,6): adipic acid and hexamethylenediamine are heated at high temperature (about 250 °C) in presence of an acid or base; water is removed.
n HOOC–(CH2)4–COOH + n H2N–(CH2)6–NH2 → [–CO–(CH2)4–CO–NH–(CH2)6–NH–]n + 2n H2O
Polyester (PET): terephthalic acid and ethylene glycol are heated with an acid or base catalyst; water is removed.
n HOOC–C6H4–COOH + n HO–CH2–CH2–OH → [–OC–C6H4–COO–CH2–CH2–O–]n + 2n H2O
- They are non-biodegradable and remain in the environment for hundreds of years.
- They pollute land and water and block drains.
- They harm marine animals and enter the food chain as microplastics.
- Burning them releases harmful gases that pollute the air.
Chemistry • Paper No. 8 • Chapter 26: Polymers • Subjective Type
