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Class 10 Chemistry Chapter 26 Polymers Class Test 7 – Full Chapter & Exercise | Punjab Board 2027
Chemistry Board Model Papers 2027 Grade 10
Class 10 Chemistry Chapter 26: Polymers – Class Test 7 (Full Chapter & Exercise) is part of the Chapter-Wise Test Series for Punjab Board 2027 Model Papers. This comprehensive test covers the complete chapter, including all topics and textbook exercises, according to the new Class 10 Chemistry syllabus issued by PECTAA Punjab. It is designed to help students revise important concepts, evaluate their understanding, practise textbook-based questions, and prepare effectively for the Class 10 Annual Examinations 2027. Students can use this full-chapter test to assess their preparation and strengthen their Chemistry knowledge before the board examinations.
Chapter # 26Full Chapter Test T-7
Full Chapter TestT-7CHAPTER # 26
Time:15 mint(Objective Type)Total Marks: 12
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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.
1.
Which one of following is a natural polymer?
(a) Protein(b) rubbers(c) Polythene(d) polyamide
Ans: (a) Protein2.
In addition polymers, the monomer join by bond.
(a) Hydrogen bond(b) Ionic(c) Covalent(d) Metallic
Ans: (c) Covalent3.
Properties of polymer can be changed by controlling their:
(a) chemical structure(b) colour(c) size(d) Temperature
Ans: (a) chemical structure4.
The repeating unit of polythene is:
(a) CH2 =CH2(b) −CH2 − CH2 −(c) −CO−NH−(d) −CO−H−
Ans: (b) −CH2 − CH2 −5.
The functional group present in polyamide is:
(a) Ester (–COO–)(b) Ether (–O–)(c) Amide (–CONH–)(d) Alcohol (–OH)
Ans: (c) Amide (–CONH–)6.
Which fiber is light weight, soft and provides warmth?
(a) Nylon(b) Polyester(c) Acrylic(d) Rayon
Ans: (c) Acrylic7.
Burning discarded plastics harmful due to:
(a) Clean environment(b) Release dangerous gases(c) Produce water(d) Purify environment
Ans: (b) Release dangerous gases8.
Which of the following polymer is a synthetic polymer:
(a) Starch(b) Cellulose(c) Animal fat(d) Polyester
Ans: (d) Polyester9.
Identify an ester linkage:
(a) (b) (c) (d)
Ans: (a) R−CO−O−R (ester linkage)10.
Which of the following polymers can be recycled?
(a) PET(b) Polystyrene(c) PVC(d) Epoxy
Ans: (a) PET786TimesPage 1 of 2
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11.
Which of the following polymers is biodegradable?
(a) Polyamide(b) Polyester(c) Starch(d) PET
Ans: (c) Starch12.
Which of the following polymers is obtained by condensation polymerization?
(a) Polyvinyl chloride(b) Polystyrene(c) Polyamide(d) Polyethene
Ans: (c) Polyamide786TimesPage 2 of 2
786Times786Times786Times786Times786Times786Times786Times786Times786Times786Times786Times786Times786Times786Times786TimesChapter # 26Full Chapter Test T-7
Full Chapter TestT-7CHAPTER # 26
Time:15 mint(Objective Type)Total Marks: 12
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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.
1.
Which one of following is a natural polymer?
(a) Protein(b) rubbers(c) Polythene(d) polyamide
Ans: (a) Protein2.
In addition polymers, the monomer join by bond.
(a) Hydrogen bond(b) Ionic(c) Covalent(d) Metallic
Ans: (c) Covalent3.
Properties of polymer can be changed by controlling their:
(a) chemical structure(b) colour(c) size(d) Temperature
Ans: (a) chemical structure4.
The repeating unit of polythene is:
(a) CH2 =CH2(b) −CH2 − CH2 −(c) −CO−NH−(d) −CO−H−
Ans: (b) −CH2 − CH2 −5.
The functional group present in polyamide is:
(a) Ester (–COO–)(b) Ether (–O–)(c) Amide (–CONH–)(d) Alcohol (–OH)
Ans: (c) Amide (–CONH–)6.
Which fiber is light weight, soft and provides warmth?
(a) Nylon(b) Polyester(c) Acrylic(d) Rayon
Ans: (c) Acrylic7.
Burning discarded plastics harmful due to:
(a) Clean environment(b) Release dangerous gases(c) Produce water(d) Purify environment
Ans: (b) Release dangerous gases786TimesPage 1 of 2
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8.
Which of the following polymer is a synthetic polymer:
(a) Starch(b) Cellulose(c) Animal fat(d) Polyester
Ans: (d) Polyester9.
Identify an ester linkage:
(a) (b) (c) (d)
Ans: (a) R−CO−O−R (ester linkage)10.
Which of the following polymers can be recycled?
(a) PET(b) Polystyrene(c) PVC(d) Epoxy
Ans: (a) PET11.
Which of the following polymers is biodegradable?
(a) Polyamide(b) Polyester(c) Starch(d) PET
Ans: (c) Starch12.
Which of the following polymers is obtained by condensation polymerization?
(a) Polyvinyl chloride(b) Polystyrene(c) Polyamide(d) Polyethene
Ans: (c) Polyamide786TimesPage 2 of 2
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Marks: 48
CHEMISTRY (SUBJECTIVE TYPE)
Time: 1:45 minute
Part – I
2.Write short answers to any Five (5) questions:[5×2=10]
(i)
Why are Polymers important in daily life?
Ans: Polymers are important because they are found in almost everything we use:
- Natural polymers (proteins, starch, cellulose, DNA) form our food, bodies and plants.
- Synthetic polymers give us clothes (nylon, polyester), plastic bags, pipes, bottles, toys, rubber tyres and medical items.
- They are light, cheap, strong, durable and easy to mould.
(ii)
How does addition polymerization occur?
Ans: In addition polymerization, many unsaturated monomers (containing a C=C double bond) join one after another. With the help of a catalyst, heat and pressure the double bond opens and the monomers link together to form a long chain. No by-product is formed.
n CH2=CH2 → −[ CH2−CH2 ]n− (Polyethene)
(iii)
Why does Polymerization continue at both ends?
Ans: Because the monomers (e.g. a dicarboxylic acid and a diol/diamine) have reactive functional groups at both ends. After one link is formed, the growing chain still has free functional groups at both its ends, so more monomers keep joining on both sides until the reactants are used up.
(iv)
How composition of polymer can changed? Give its importance.
Ans: The composition of a polymer can be changed by using two or more different monomers (copolymerization) or by changing the monomer used / adding substances such as plasticizers and fillers.
Importance: It gives polymers the desired properties such as strength, flexibility, hardness, melting point, colour and resistance to chemicals.
Importance: It gives polymers the desired properties such as strength, flexibility, hardness, melting point, colour and resistance to chemicals.
(v)
How starting monomer are prepare from addition monomer?
Ans: Addition monomers are mostly alkenes obtained by cracking of petroleum fractions (e.g. ethene from ethane/naphtha). Other monomers are made from ethene, e.g. vinyl chloride:
CH2=CH2 + Cl2 → CH2Cl−CH2Cl →(heat) CH2=CHCl + HCl
(vi)
How dicarboxylic acid recover from polyester?
Ans: By hydrolysis. When polyester is heated with water (acid or alkali), its ester linkages break and the original monomers, dicarboxylic acid and diol, are recovered.
−CO−R−CO−O−R’−O− + H2O → HOOC−R−COOH + HO−R’−OH
(vii)
Write the uses of Plastics.
Ans:
- Packaging bags, bottles, containers and films
- Pipes, sheets, electrical insulation and wire coating
- Toys, furniture, kitchenware and stationery
- Car and aeroplane parts, medical syringes and equipment
(viii)
Write the properties of plastics.
Ans:
- Light in weight, strong and durable
- Resistant to corrosion, water and chemicals
- Poor conductors of heat and electricity
- Easily moulded into any shape and cheap
- Mostly non-biodegradable
3.Write short answers to any Five (5) questions:[5×2=10]
(i)
What is Synthetic fibers? Give example.
Ans: Synthetic fibers are man-made fibers prepared from chemicals (mainly petroleum products) by polymerization. Examples: nylon, polyester (terylene), acrylic.
(ii)
Write the properties of Synthetic fiber.
Ans:
- Strong, elastic and long lasting
- Light in weight and dry quickly
- Wrinkle resistant and easy to wash
- Not attacked by moths or fungus
- Absorb little water and melt on heating
(iii)
Which natural fiber does acrylic resemble and why?
Ans: Acrylic resembles wool, because it is soft, warm, light and fluffy and traps heat like wool. So it is used as a cheap substitute for wool in sweaters, blankets and carpets.
(iv)
Why is Burning Plastic dangerous?
Ans: Burning plastic releases poisonous gases such as CO, HCl, HCN and dioxins, and CO2. They pollute the air, cause breathing problems, cancer, acid rain and global warming.
(v)
Give an example of a commercial product which is formed using polyethene.
Ans: Shopping (polythene) bags, plastic bottles, water pipes, packaging film and toys are made from polyethene.
(vi)
How an ester linkage between two monomer is formed?
Ans: The −COOH group of a carboxylic acid reacts with the −OH group of an alcohol (diol) and a molecule of water is eliminated, forming the ester linkage −COO−.
R−COOH + HO−R’ → R−CO−O−R’ + H2O
(vii)
How does condensation polymerization occur?
Ans: In condensation polymerization, monomers having two functional groups (e.g. −COOH and −OH, or −COOH and −NH2) join together with the elimination of a small molecule such as H2O or HCl at each step, forming polyesters or polyamides.
(viii)
How polymers are useful for us?
Ans: Polymers are used in clothes, food packing, building materials, furniture, vehicles, electronics, household items and medicines. Natural polymers (starch, proteins) are also our food.
4.Write short answers to any Five (5) questions:[5×2=10]
(i)
Draw the structure of polyamide linkage.
Ans: The polyamide (amide) linkage is formed between −COOH and −NH2 groups:
−CO−NH− (Amide / Peptide linkage)
(ii)
Give two examples each of addition polymers and condensation polymers.
Ans:
Addition polymers: (1) Polyethene (2) Polyvinyl chloride (PVC) / Polystyrene.
Condensation polymers: (1) Nylon-6,6 (2) Polyester (Terylene / PET).
Addition polymers: (1) Polyethene (2) Polyvinyl chloride (PVC) / Polystyrene.
Condensation polymers: (1) Nylon-6,6 (2) Polyester (Terylene / PET).
(iii)
How synthetic fibers are different from natural fibers?
Ans:
- Source: Synthetic fibers are man-made from petrochemicals; natural fibers come from plants and animals (cotton, wool, silk).
- Strength: Synthetic fibers are stronger, more elastic and wrinkle resistant.
- Water absorption: Natural fibers absorb more water; synthetic fibers absorb very little.
- Decay: Natural fibers are biodegradable, synthetic fibers are not.
(iv)
Are natural polymers hazardous for the environment? Explain why?
Ans: No. Natural polymers (cotton, wool, starch, proteins) are biodegradable. Bacteria and fungi break their linkages (by hydrolysis) into simple, harmless substances, so they do not pile up and pollute the environment.
(v)
Why is it dangerous to burn discarded articles made of plastics?
Ans: Burning plastics gives off toxic gases (CO, HCl, HCN, dioxins) and black smoke. These cause air pollution, respiratory diseases, cancer, acid rain and global warming.
(vi)
Why is it not advisable to dump discarded synthetic articles in oceans?
Ans: Synthetic articles are non-biodegradable. In oceans they pollute water, harm and kill marine animals (they swallow or get tangled in them), break into microplastics that enter the food chain, and damage coral reefs.
(vii)
What is the role of catalyst in addition polymerization?
Ans: The catalyst (initiator) starts the reaction by opening the double bond of the monomer (forming free radicals) and speeds it up at lower temperature and pressure. It is not used up in the reaction.
(viii)
Deduce the monomer from the following addition polymers.
(a)
(b)
Ans: To find the monomer, remove the brackets and n, and change the single bond between the two carbons into a double bond. (a) Vinyl chloride (Chloroethene) (b) Acrylonitrile (Propenenitrile)
(a)
(b)
Part – II
NOTE:- Attempt any two questions.[9×2=18]
5.
(a)
What is polymerization? Give its importance.
Definition: The process in which a large number of small molecules called monomers join together by chemical bonds to form a very large molecule called a polymer is called polymerization.
n (Monomer) → [ Polymer ]n
Importance: - We get plastics, synthetic fibers, rubber, paints and adhesives from it.
- Polymers can be designed with required properties (strength, flexibility, heat resistance).
- They replace costly or scarce natural materials like wool, silk, wood and metals.
- Used in medicine (syringes, artificial organs), electronics, packing, building and vehicles.
- It gives employment and strengthens industry and economy.
(b)
Write about types of polymers.
Types of polymers:
- On the basis of origin
- Natural polymers: found in nature, e.g. starch, cellulose, proteins, wool, silk, natural rubber.
- Synthetic polymers: man-made, e.g. polyethene, PVC, nylon, polyester.
- On the basis of method of formation
- Addition polymers: formed by joining unsaturated monomers without loss of any molecule, e.g. polyethene, PVC, polystyrene, polyacrylonitrile.n CH2=CH2 → −[CH2−CH2]n−
- Condensation polymers: formed from bifunctional monomers with elimination of small molecules (H2O, HCl), e.g. nylon-6,6, polyester, Bakelite.
- Addition polymers: formed by joining unsaturated monomers without loss of any molecule, e.g. polyethene, PVC, polystyrene, polyacrylonitrile.
- On the basis of structure: linear, branched and cross-linked polymers.
- On the basis of behaviour on heating: thermoplastics (soften on heating, e.g. polyethene) and thermosetting plastics (do not soften, e.g. Bakelite).
6.
(a)
Define Condensation Polymerizations. Write its properties.
Definition: The process in which bifunctional monomers join together by repeated condensation reactions with the elimination of small molecules (such as H2O, HCl, NH3) to form a polymer is called condensation polymerization.
HOOC−R−COOH + HO−R’−OH → −[ OC−R−CO−O−R’−O ]n− + nH2O
Properties: - Monomers must have two functional groups (e.g. −COOH, −OH, −NH2).
- A small molecule (usually water) is eliminated at every step.
- The chain grows from both ends, step by step.
- Molar mass of polymer is not an exact multiple of the monomer.
- Products are polyesters, polyamides etc. with linkages −COO− or −CONH−.
- Polymers can be broken back into monomers by hydrolysis.
(b)
Write structure of monomer from polymer.
Method: Addition polymers: remove the brackets and n, and put a double bond between the two carbons of the repeating unit. Condensation polymers: break the ester/amide linkage and add −OH / H to get the monomers. Condensation polymer (Polyester): hydrolysis gives
→
Polyethene → Ethene→
PVC → Vinyl chloride→
Polyacrylonitrile → Acrylonitrile−[ OC−R−CO−O−R’−O ]n− + H2O → HOOC−R−COOH + HO−R’−OH
Nylon-6,6 gives adipic acid HOOC−(CH2)4−COOH and hexamethylenediamine H2N−(CH2)6−NH2.7.
(a)
Describe the role of synthetic polymers in the textile industry.
Ans: Synthetic polymers have changed the textile industry greatly:
- Nylon (polyamide): strong and elastic; used in ropes, parachutes, socks, fishing nets and carpets.
- Polyester (terylene): wrinkle-free, quick-drying; used in shirts, suits, curtains and bed sheets. PET is also used for bottles.
- Acrylic: resembles wool; used in sweaters, shawls, blankets and artificial fur.
- They are cheaper than natural fibers and available in large quantity throughout the year.
- They are mixed (blended) with cotton and wool, e.g. polycotton, to combine the comfort of natural fibers with the strength and easy care of synthetic ones.
- They resist moths, fungus and chemicals, and last longer.
- Fibers can be made in any colour, thickness and texture, which gives wide variety in fashion and clothing.
(b)
Describe the effects of synthetic polymers on the environment.
Ans: Most synthetic polymers are non-biodegradable and cause serious environmental problems:
- Land pollution: Plastic waste does not rot for hundreds of years and fills dumping sites; it blocks drains, causes floods and reduces soil fertility.
- Water pollution: Dumped in rivers and oceans, plastic kills fish, turtles and birds, and breaks into microplastics that enter the food chain.
- Air pollution: Burning plastics releases toxic gases like CO, HCl, HCN and dioxins, which cause respiratory diseases, cancer, acid rain and global warming.
- Resources: They are made from petroleum, a non-renewable resource.
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