Polymers

01

PYQ 2014

medium

chemistry ID: mht-cet-

Identify the polymer obtained from 1,3-butadiene and acrylonitrile.

1

Polyacrylamide

2

Buna N

3

Glyptal

4

Perspex

02

PYQ 2014

medium

chemistry ID: mht-cet-

Which from following polymers is used to obtain plastic dinner ware?

1

Backelite

2

Teflon

3

Melamine-formaldehyde

4

Polyacrylonitrile

03

PYQ 2017

medium

chemistry ID: mht-cet-

The monomers used in preparation of dextron are

1

lactic acid and glycollic acid

2

-Hydroxybutanoic acid and -Hydroxypenlanoic acid

3

styrene and -Butadiene

4

hexamethylenediamine and adipic acid

04

PYQ 2020

medium

chemistry ID: mht-cet-

Which among the following polymers is used for wrapping food?

1

Dacron

2

Nylon-6

3

Lexan

4

Saran

05

PYQ 2020

medium

chemistry ID: mht-cet-

Identify the monomers used in preparation of PHBV polymer.

1

Styrene and glycolic acid

2

Lactic acid and glycolic acid

3

3-Hydroxy butanoic acid and 3-hydroxy pentanoic acid

4

Glycine and ω-amino caproic acid

06

PYQ 2020

medium

chemistry ID: mht-cet-

Which of the following polymers is used to obtain adhesives?

1

Neoprene rubber

2

Buna - N

3

Buna - S

4

Melamine

07

PYQ 2020

medium

chemistry ID: mht-cet-

Which among the following carbocation is most reactive?

1

2

3

4

08

PYQ 2020

medium

chemistry ID: mht-cet-

$The rate constant for the first order reaction is . How long will 5 g of the reactant take to reduce to 3 g?$

1

$424 sec$

2

$414 sec$

3

$434 sec$

4

$444 sec$

Official Solution

Correct Option: $(4)$

$Step 1: Understanding the first-order rate equation. For a first-order reaction, the relation is given by: Where: - is the initial concentration of the reactant - is the concentration at time - is the rate constant - is the time Step 2: Substituting the values. We know that,, and . Substituting these values into the equation, we get: Solving for, we get . Step 3: Conclusion. The correct answer is (D) 444 sec .$

09

PYQ 2020

medium

chemistry ID: mht-cet-

$Identify addition polymer from following$

1

$Nylon-6,6$

2

$Polyester$

3

$Orlon$

4

$Urea formaldehyde polymer$

Official Solution

Correct Option: $(3)$

$Step 1: Understanding addition polymers. Addition polymers are formed by the repeated addition of monomer units without the elimination of any small molecule. Step 2: Analysis of given polymers. Orlon is polyacrylonitrile and is formed by addition polymerization of acrylonitrile monomers. Nylon-6,6, polyester, and urea formaldehyde polymer are condensation polymers formed with elimination of small molecules like water. Step 3: Conclusion. Therefore, the correct answer is (C) Orlon .$

10

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following polymers belongs to the class of thermoplastic polymers?$

1

$Bakelite$

2

$Polythene$

3

$Terylene$

4

$Neoprene$

Official Solution

Correct Option: $(2)$

$Step 1: Understand thermoplastic polymers. Thermoplastic polymers soften on heating and harden on cooling. This process is reversible and they can be reshaped repeatedly. Step 2: Analyze the given options. Bakelite is a thermosetting polymer and does not soften on heating. Terylene is a polyester and is not classified as a simple thermoplastic in this context. Neoprene is an elastomer. Polythene softens on heating and can be remoulded, hence it is a thermoplastic polymer. Step 3: Conclusion. Therefore, polythene belongs to the class of thermoplastic polymers.$

11

PYQ 2020

medium

chemistry ID: mht-cet-

$Identify the monomers used in preparation of Novolac.$

1

$Phenol and Ethanol$

2

$Urea and Phenol$

3

$Phenol and Methanal$

4

$Urea and Methanal$

Official Solution

Correct Option: $(3)$

$Step 1: Understand Novolac polymer. Novolac is a phenol-formaldehyde resin formed under acidic conditions with excess phenol. Step 2: Identify the monomers involved. The two monomers required are phenol and methanal (formaldehyde). Their condensation leads to the formation of Novolac resin. Step 3: Eliminate incorrect options. Options involving ethanol or urea are incorrect, as they do not form phenol-formaldehyde resins. Step 4: Conclusion. Thus, the correct monomers used in the preparation of Novolac are phenol and methanal.$

12

PYQ 2020

medium

chemistry ID: mht-cet-

$What products are expected from the disproportionation reaction of orthophosphorous acid?$

1

2

3

4

Official Solution

Correct Option: $(2)$

$Step 1: Understanding disproportionation. Disproportionation is a reaction in which the same element undergoes both oxidation and reduction. Step 2: Oxidation state of phosphorus. In orthophosphorous acid (), phosphorus has oxidation state +3. Step 3: Products formed. Phosphorus is oxidised to +5 state in phosphoric acid () and reduced to -3 state in phosphine (). Step 4: Conclusion. Thus, the products are phosphoric acid and phosphine.$

13

PYQ 2020

medium

chemistry ID: mht-cet-

$A certain zero order reaction has rate constant 0.025 M s . What will be the concentration of reactant A after 15 seconds if initial concentration is 0.50 M?$

1

$0.060 M$

2

$0.50 M$

3

$0.125 M$

4

$0.375 M$

Official Solution

Correct Option: $(3)$

$Step 1: Write integrated rate law for zero order reaction. Step 2: Substitute given values. Step 3: Calculate concentration after 15 s. Step 4: Conclusion. Concentration of reactant A after 15 seconds is 0.125 M.$

14

PYQ 2020

medium

chemistry ID: mht-cet-

$Silver crystallises in face centred cubic structure. If radius of silver atom is 144.5 pm, what is the edge length of unit cell?$

1

$408.6 pm$

2

$289.0 pm$

3

$428.6 pm$

4

$333.7 pm$

Official Solution

Correct Option: $(1)$

$Step 1: Recall the relation between atomic radius and edge length for FCC lattice. In face centred cubic (FCC) structure: Step 2: Substitute the given value of radius. Step 3: Calculate the edge length. Step 4: Conclusion. The edge length of the unit cell is 408.6 pm.$

15

PYQ 2020

medium

chemistry ID: mht-cet-

$An element crystallises in bcc structure. The number of unit cells of an element in 4 g of it is (given atomic mass = 40).$

1

2

3

4

Official Solution

Correct Option: $(1)$

$Step 1: Calculating number of moles. Step 2: Calculating number of atoms. Step 3: Using bcc structure information. In a body-centered cubic (bcc) structure, each unit cell contains 2 atoms. Step 4: Calculating number of unit cells. Step 5: Conclusion. Hence, the correct answer is option (A).$

16

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following polymers is a heteropolymer?$

1

$Nylon-6$

2

$Polythene$

3

$Buna-N$

4

$Polystyrene$

Official Solution

Correct Option: $(3)$

$Step 1: Understanding heteropolymers. A heteropolymer (or copolymer) is a polymer made from two or more different monomers. Buna-N is made by the polymerization of acrylonitrile and butadiene, thus it is a heteropolymer. Step 2: Analyzing the options. (A) Nylon-6: Nylon-6 is a homopolymer, made from a single type of monomer, caprolactam. (B) Polythene: Polythene is also a homopolymer, made from ethylene. (C) Buna-N: This is the correct answer as it is a heteropolymer made from acrylonitrile and butadiene. (D) Polystyrene: Polystyrene is a homopolymer, made from a single monomer, styrene. Step 3: Conclusion. The correct answer is (C) Buna-N .$

17

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following polymers is used to obtain bulletproof vests and helmets?$

1

$Dynel$

2

$Glyptal$

3

$Nomex$

4

$Kevlar$

Official Solution

Correct Option: $(4)$

$Step 1: Understanding the uses of Kevlar. Kevlar is a strong synthetic polymer known for its high tensile strength and durability. It is commonly used in the manufacturing of bulletproof vests, helmets, and other protective gear due to its strength and lightweight properties. Step 2: Analyzing the options. (A) Dynel: Dynel is a polymer used in textiles but is not typically used for bulletproof vests. (B) Glyptal: Glyptal is a resin used in coatings and paints, not in bulletproof materials. (C) Nomex: Nomex is another heat-resistant polymer used in protective clothing, but it is not used in bulletproof vests and helmets. (D) Kevlar: Kevlar is the correct answer, as it is widely used in bulletproof materials and protective gear. Step 3: Conclusion. The correct polymer used for bulletproof vests and helmets is (D) Kevlar .$

18

PYQ 2020

medium

chemistry ID: mht-cet-

$Identify the use of Buna-N.$

1

$In making soles of shoes$

2

$To prepare bubble gums$

3

$For making inner tubes of tyres$

4

$To manufacture chemical containers$

Official Solution

Correct Option: $(1)$

$Step 1: Understand Buna-N. Buna-N is a synthetic rubber also known as nitrile rubber. It is a copolymer of butadiene and acrylonitrile. Step 2: Properties of Buna-N. Buna-N has good resistance to oils, fuels, and abrasion. It also has good mechanical strength and durability. Step 3: Analyze the options. (A) In making soles of shoes: Due to its abrasion resistance and toughness, Buna-N is commonly used in shoe soles. (B) To prepare bubble gums: Bubble gum uses natural polymers, not Buna-N. (C) For making inner tubes of tyres: Inner tubes are mainly made from natural rubber. (D) To manufacture chemical containers: Plastics, not Buna-N, are generally used. Step 4: Conclusion. Buna-N is used in making soles of shoes.$

19

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following polymers is obtained first by formation of salt by neutralization and then by step growth polymerisation?$

1

$Polyester$

2

$Nylon-6$

3

$Nylon-6,6$

4

$Novolac$

Official Solution

Correct Option: $(3)$

$Step 1: Understand the process mentioned in the question. The question refers to a polymer formed first by salt formation through neutralization, followed by step growth (condensation) polymerisation. Step 2: Identify the polymer formed via salt formation. In the preparation of Nylon-6,6, hexamethylenediamine reacts with adipic acid to form a salt known as nylon salt. Step 3: Polymerisation step. This nylon salt on heating undergoes step growth polymerisation with elimination of water to form Nylon-6,6. Step 4: Eliminate other options. (A) Polyester: Formed directly by condensation, not via salt formation. (B) Nylon-6: Prepared by ring opening polymerisation of caprolactam. (D) Novolac: A phenol-formaldehyde resin formed without salt formation. Step 5: Conclusion. Nylon-6,6 is obtained by salt formation followed by step growth polymerisation.$

20

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following is a linear polymer?$

1

$Melamine$

2

$Vulcanised rubber$

3

$Polyvinyl chloride$

4

$Polypropylene$

Official Solution

Correct Option: $(3)$

$Step 1: Understand linear polymers. Linear polymers consist of long straight chains without significant cross-linking or branching. Such polymers generally have higher density and are soluble in suitable solvents. Step 2: Analyse the given options. (A) Melamine: Forms a cross-linked polymer when reacted with formaldehyde, hence not linear. (B) Vulcanised rubber: Contains extensive cross-linking due to sulphur bridges. (C) Polyvinyl chloride (PVC): Consists of long linear chains of repeating vinyl chloride units. (D) Polypropylene: Commonly shows branching depending on tacticity and is not strictly linear in this context. Step 3: Conclusion. Polyvinyl chloride is a typical example of a linear polymer.$

21

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following polymers is prepared by using phenol?$

1

$Bakelite$

2

$Melamine$

3

$Teflon$

4

$Neoprene$

Official Solution

Correct Option: $(1)$

$Step 1: Identify phenol-based polymers. Phenol reacts with formaldehyde under acidic or basic conditions to form phenol-formaldehyde resins. Step 2: Formation of Bakelite. Bakelite is a thermosetting polymer obtained from condensation polymerisation of phenol and formaldehyde. Step 3: Analyse other options. Melamine: Prepared from melamine and formaldehyde. Teflon: Polymer of tetrafluoroethylene. Neoprene: Polymer of chloroprene. Step 4: Conclusion. Bakelite is the polymer prepared using phenol.$

22

PYQ 2020

easy

chemistry ID: mht-cet-

$Identify the polymer obtained by heating n moles of isobutylene with n moles of isoprene at 100°C in the presence of anhydrous AlCl .$

Official Solution

Correct Option: $(1)$

23

PYQ 2020

medium

chemistry ID: mht-cet-

$Resultant of two forces and is of magnitude . If is reversed, the resultant of two forces is of magnitude . The value of is$

1

2

3

4

Official Solution

Correct Option: $(4)$

$Step 1: Use the formula for the magnitude of the resultant force. When two forces and are applied, the magnitude of the resultant force is given by: where is the angle between the forces. When is reversed, the new resultant is: Step 2: Calculate . Now, we calculate : Adding these two equations: Thus, we get: Step 3: Conclusion. Thus, the value of is, which corresponds to option (D).$

24

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following polymers is prepared by using Ziegler - Natta catalyst?$

1

$HDPE$

2

$LDPE$

3

$Orlon$

4

$Dacron$

Official Solution

Correct Option: $(1)$

$Step 1: Understanding the Question. The question is about the polymer prepared using Ziegler-Natta catalyst, which is a catalyst system used in polymerization reactions. Step 2: Analyzing the options. (A) HDPE: Correct — High-Density Polyethylene (HDPE) is synthesized using the Ziegler-Natta catalyst, which helps in the polymerization of ethylene. (B) LDPE: Low-Density Polyethylene (LDPE) is made using free-radical polymerization, not Ziegler-Natta catalyst. (C) Orlon: This is an acrylic polymer made from acrylonitrile, and it is not made using the Ziegler-Natta catalyst. (D) Dacron: This polyester is made from terephthalic acid and ethylene glycol, and not through the Ziegler-Natta process. Step 3: Conclusion. The correct answer is (A) HDPE, as it is prepared using the Ziegler-Natta catalyst.$

25

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following monomers is used in manufacture of Neoprene rubber?$

1

$1,3-Butadien$

2

$Styrene$

3

$2-chlorobuta-1,3-diene$

4

$Isobutylene$

Official Solution

Correct Option: $(3)$

$Step 1: Understanding Neoprene Rubber. Neoprene rubber is made by the polymerization of 2-chlorobuta-1,3-diene (also known as chloroprene). The monomer undergoes free radical polymerization to form the polymer used in neoprene rubber. Step 2: Analyzing the options. (A) 1,3-Butadiene: Incorrect. This is used in the manufacture of Buna-N rubber, not neoprene. (B) Styrene: Incorrect. Styrene is used in the manufacture of polystyrene, not neoprene. (C) 2-chlorobuta-1,3-diene: Correct. This is the monomer used to make neoprene rubber. (D) Isobutylene: Incorrect. Isobutylene is used to make butyl rubber, not neoprene. Step 3: Conclusion. The correct monomer for neoprene rubber is 2-chlorobuta-1,3-diene, corresponding to option (C) .$

26

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following ore is concentrated by froth flotation process?$

1

$Diaspore$

2

$Bauxite$

3

$Dolomite$

4

$Galena$

Official Solution

Correct Option: $(4)$

$Step 1: Understanding froth flotation process. Froth flotation is a method used for concentrating ores, especially those with sulfide minerals like galena (PbS). This method works by selectively separating hydrophobic materials from hydrophilic ones in a mixture. Step 2: Analyzing the options. (A) Diaspore: This ore is not concentrated by froth flotation; it is an aluminum oxide ore. (B) Bauxite: Bauxite is also not concentrated using froth flotation; it’s typically refined through Bayer’s process. (C) Dolomite: Dolomite is not concentrated using froth flotation; it’s usually processed by calcination. (D) Galena: Galena, a lead sulfide ore, is concentrated by the froth flotation process. Step 3: Conclusion. The correct answer is (D) Galena .$

27

PYQ 2020

medium

chemistry ID: mht-cet-

$Zirconium is refined by ..................$

1

$Liquation process$

2

$Mond process$

3

$Van Arkel method$

4

$Electrolytic refining process$

Official Solution

Correct Option: $(3)$

$Step 1: Understanding the refining methods. Zirconium is refined using the Van Arkel method, which involves the formation of a volatile compound of zirconium, followed by its decomposition to yield pure zirconium metal. Step 2: Analyzing the options. (A) Liquation process: This process is used for separating metals like tin and lead but is not used for zirconium. (B) Mond process: This process is used for refining nickel, not zirconium. (C) Van Arkel method: This is the correct method for refining zirconium. (D) Electrolytic refining process: This process is used for metals like copper but is not used for zirconium. Step 3: Conclusion. The correct answer is (C) Van Arkel method .$

28

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following monomers is used to prepare Teflon?$

1

2

3

4

Official Solution

Correct Option: $(2)$

$Step 1: Understanding Teflon. Teflon is a polymer of tetrafluoroethylene (). The monomer used in its preparation is . Step 2: Analyzing the options. (A) : This is the monomer for propylene, not Teflon. (B) : Correct — This is the monomer for Teflon. (C) : This is the monomer for vinyl chloride, not Teflon. (D) : This is the monomer for propene, not Teflon. Step 3: Conclusion. The correct answer is (B), the monomer for Teflon.$

29

PYQ 2020

medium

chemistry ID: mht-cet-

$Which polymer is obtained from monomers 3-Hydroxy butanoic acid and 3-Hydroxy pentanoic acid?$

1

$PHBV$

2

$Dextron$

3

$Nylon-2-nylon-6$

4

$HDPE$

Official Solution

Correct Option: $(1)$

$Step 1: Understanding PHBV. Polyhydroxybutyrate-co-hydroxyvalerate (PHBV) is a biodegradable plastic polymer obtained from the copolymerization of 3-hydroxybutanoic acid and 3-hydroxyvaleric acid (or 3-hydroxy pentanoic acid). It is synthesized through bacterial fermentation. Step 2: Analyzing the options. (A) PHBV: Correct — PHBV is the polymer made from these two monomers. (B) Dextron: Incorrect — Dextron is a different polymer. (C) Nylon-2-nylon-6: Incorrect — Nylon-2-nylon-6 is not made from these monomers. (D) HDPE: Incorrect — HDPE is made from ethylene, not the given monomers. Step 3: Conclusion. The correct answer is (A) PHBV, as it is formed from 3-hydroxybutanoic acid and 3-hydroxy pentanoic acid.$

30

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following is a cross-linked polymer?$

1

$PVC$

2

$Orlon$

3

$Vulcanised rubber$

4

$Polypropylene$

Official Solution

Correct Option: $(3)$

$Step 1: Define cross-linked polymer. Cross-linked polymers have covalent bonds connecting different polymer chains, forming a three-dimensional network. Step 2: Vulcanisation process. In vulcanised rubber, sulphur forms cross-links between polyisoprene chains, increasing strength and elasticity. Step 3: Eliminate other options. PVC, Orlon, and polypropylene are linear polymers without cross-linking. Step 4: Conclusion. Therefore, vulcanised rubber is a cross-linked polymer.$

31

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following reaction of diazonium salt involves retention of diazonium group?$

1

$Reaction with phenol$

2

$Reaction with phosphinic acid$

3

$Reaction with dilute sulfuric acid$

4

$Reaction with HCl and Cu powder$

Official Solution

Correct Option: $(1)$

$Step 1: Understanding diazonium salt reactions. Diazonium salts can react with phenols to form azo compounds, retaining the diazonium group during the reaction. This reaction is known as diazotization. Step 2: Analyzing the options. (A) Reaction with phenol: Correct — This reaction involves the retention of the diazonium group in the final product (azo compound). (B) Reaction with phosphinic acid: This reaction leads to the elimination of the diazonium group. (C) Reaction with dilute sulfuric acid: This reaction typically leads to the elimination of the diazonium group. (D) Reaction with HCl and Cu powder: This reaction also leads to the elimination of the diazonium group. Step 3: Conclusion. The correct answer is (A) Reaction with phenol .$

32

PYQ 2020

medium

chemistry ID: mht-cet-

$What is the coordination number of cation in ionic compound if the type of hole occupied by cation is cubic?$

1

$3$

2

$4$

3

$8$

4

$6$

Official Solution

Correct Option: $(3)$

$Step 1: Understanding coordination number and cubic holes. In ionic compounds, the coordination number refers to the number of ions or atoms surrounding a central ion in the lattice structure. When a cation occupies a cubic hole in the lattice, the coordination number is 8. Step 2: Analyzing the options. (A) 3: This is the coordination number for a trigonal planar geometry, not cubic. (B) 4: This is the coordination number for a tetrahedral hole, not cubic. (C) 8: Correct — The coordination number for a cation in a cubic hole is 8. (D) 6: This is the coordination number for an octahedral geometry, not cubic. Step 3: Conclusion. The correct answer is (C) 8 .$

33

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following polymer is used to make crockeries?$

1

$Melamine$

2

$HDPE$

3

$Buna-S$

4

$Buna-N$

Official Solution

Correct Option: $(1)$

$Step 1: Identify the material required for crockery. Crockery requires materials that are heat resistant, hard, and chemically inert. Step 2: Properties of melamine. Melamine forms a thermosetting polymer (melamine-formaldehyde resin) which is hard, glossy, and heat resistant. Step 3: Eliminate other options. HDPE is used for containers, while Buna-S and Buna-N are synthetic rubbers. Step 4: Conclusion. Thus, melamine is used to make crockeries.$

34

PYQ 2020

medium

chemistry ID: mht-cet-

$Which of the following properties is of thermoplastic polymer?$

1

$These can’t be recycled.$

2

$These are either linear or branched chain polymers.$

3

$These can’t be remoulded.$

4

$These do not become soft on heating.$

Official Solution

Correct Option: $(2)$

$Step 1: Understanding thermoplastic polymers. Thermoplastic polymers are a type of polymer that can be easily remolded and recycled when heated. They consist of linear or branched chain polymers. Step 2: Analyzing the options. (A) These can’t be recycled: Incorrect, thermoplastics are recyclable. (B) These are either linear or branched chain polymers: Correct — Thermoplastic polymers are characterized by their linear or branched chain structures. (C) These can’t be remoulded: Incorrect, thermoplastics can be remoulded when heated. (D) These do not become soft on heating: Incorrect, thermoplastics become soft and moldable when heated. Step 3: Conclusion. The correct answer is (B) These are either linear or branched chain polymers.$

35

PYQ 2020

medium

chemistry ID: mht-cet-

$Which among the following polymers belongs to the class elastomers?$

1

$Polystyrene$

2

$Nylon$

3

$Neoprene$

4

$Bakelite$

Official Solution

Correct Option: $(3)$

$Step 1: Understanding elastomers. Elastomers are polymers that have elastic properties, meaning they can stretch and return to their original shape. They typically have low intermolecular forces and are used in products like rubber. Step 2: Analyzing the options. (A) Polystyrene: Polystyrene is a thermoplastic polymer, not an elastomer. (B) Nylon: Nylon is a thermoplastic polymer, used in fibers and plastics, not elastomers. (C) Neoprene: Neoprene is a synthetic rubber that is used as an elastomer in various applications like gaskets, seals, and wetsuits. (D) Bakelite: Bakelite is a thermosetting plastic, not an elastomer. Step 3: Conclusion. The correct answer is (C) Neoprene, which is an elastomer.$

36

PYQ 2022

easy

chemistry ID: mht-cet-

$Which from following polymers is obtained using$

1

$Buna-S$

2

$Polyacrylonitrile$

3

$PVC$

4

$Glyptal$

Official Solution

Correct Option: $(3)$

$Solution: Understanding the Structure: The structure is represented as follows: CH2=CH-Cl This is a vinyl chloride monomer, which consists of a vinyl group (-CH=CH2) attached to a chlorine atom. This monomer undergoes polymerization to form a polymer known as polyvinyl chloride (PVC) . Polyvinyl Chloride (PVC): PVC is one of the most widely produced synthetic plastics. It is formed by the polymerization of vinyl chloride monomers. PVC is used in various applications such as pipes, flooring, medical devices, and electrical insulation. Other Options: Let’s briefly look at the other options to understand why they are not correct: Buna-S: Buna-S is a type of synthetic rubber made from the polymerization of styrene and butadiene, not vinyl chloride. Polyacrylonitrile: Polyacrylonitrile (PAN) is made from the polymerization of acrylonitrile monomers, not vinyl chloride. Glyptal: Glyptal is a polymer formed from the condensation of phthalic acid and glycerol, not vinyl chloride. Conclusion: The polymer obtained from the monomer shown in the image is Polyvinyl Chloride (PVC) . Therefore, the correct answer is: Option 3: PVC$

37

PYQ 2022

easy

chemistry ID: mht-cet-

$Explain structure of polyacrylonitrile.$

Official Solution

Correct Option: $(1)$

38

PYQ 2022

easy

chemistry ID: mht-cet-

$What is the Monomer of Neoprene?$

Official Solution

Correct Option: $(1)$

$Solution: Monomer of Neoprene Neoprene is a type of synthetic rubber that has a wide range of industrial applications. It is known for its durability, resistance to oil, chemicals, and weather, making it ideal for various products such as wetsuits, gaskets, hoses, and electrical insulation. Neoprene is produced through the polymerization of a specific monomer. Monomer of Neoprene: The monomer of neoprene is chloroprene . Chloroprene is an organic compound with the chemical formula: CH2=C(CH3)CH=CH2 Polymerization Process: Neoprene is synthesized through a process called polymerization, where multiple chloroprene molecules chemically bond to form long chains. This polymerization process creates the synthetic rubber known as neoprene. The resulting polymer has a wide variety of uses due to its unique properties such as flexibility, durability, and resistance to various environmental factors. Applications of Neoprene: Neoprene's ability to resist wear, chemicals, and weather makes it suitable for a variety of industrial and commercial applications. Some common products made from neoprene include: Wetsuits Gaskets Hoses Electrical insulation Shock absorbers Conclusion: The monomer of neoprene is chloroprene . Through the polymerization of chloroprene molecules, neoprene is formed, which has a broad range of applications due to its versatile properties.$

39

PYQ 2022

medium

chemistry ID: mht-cet-

$Identify the use of Buna-S from following.$

1

$To obtain tyres$

2

$To obtain unbreakable dinner ware$

3

$To obtain gaskets$

4

$To obtain water pipes$

Official Solution

Correct Option: $(3)$

$Concept: Buna-S, also known as Styrene-Butadiene Rubber (SBR), is a synthetic rubber widely used in industrial and commercial applications. It is created through the polymerization of butadiene and styrene, which gives the material a good balance of flexibility, durability, and resistance to wear and tear. Properties of Buna-S: • High resistance to abrasion and tearing • Excellent sealing capability • Good resistance to oils, fuels, and many industrial chemicals • Stable across a wide range of temperatures Application in Gaskets: Because of these properties, Buna-S is especially suitable for manufacturing gaskets . A gasket is a mechanical seal used to fill the space between two or more mating surfaces to prevent leakage of fluids or gases under compression. Industries Using Buna-S Gaskets: • Automotive industry: Used in engines, transmissions, and fuel systems to prevent leakage of oil, fuel, and coolant. • Plumbing systems: Used in pipe fittings and joints to ensure water-tight seals. • Industrial manufacturing: Used in machinery and chemical equipment to provide long-lasting seals against high-pressure fluids and gases. Conclusion: Due to its excellent chemical resistance and reliable sealing capability, Buna-S is widely used to obtain gaskets for a variety of industrial and mechanical applications. Therefore, the correct option is: (C) To obtain gaskets .$

40

PYQ 2023

easy

chemistry ID: mht-cet-

$Which of the following is a biodegradable polymer?$

Official Solution

Correct Option: $(1)$

$Biodegradable polymers are those that can be broken down by microorganisms in the environment. These polymers are typically natural or synthetic polymers that decompose into harmless substances, such as water, carbon dioxide, and biomass, over time. Cellulose: Cellulose is a natural polymer found in the cell walls of plants. It is a biopolymer made up of glucose units linked by β-1,4-glycosidic bonds. Cellulose is biodegradable because microorganisms such as bacteria and fungi can break down the glucose-based structure into smaller, non-toxic compounds, ultimately leading to its decomposition. This makes cellulose an important biodegradable polymer used in various applications like paper, textiles, and biodegradable plastics. Other options: Polyethylene: Polyethylene is a synthetic polymer that is widely used in plastic products like bags and bottles. It is not biodegradable and can persist in the environment for hundreds of years, contributing to plastic pollution. Polypropylene: Similar to polyethylene, polypropylene is another synthetic polymer that is commonly used for packaging, textiles, and containers. It is also non-biodegradable. Polystyrene: Polystyrene is another synthetic polymer often found in packaging materials, disposable cutlery, and foam products. It is not biodegradable and can take a long time to break down in the environment. Conclusion: Among the options, cellulose is the only biodegradable polymer, making it the correct answer.$

41

PYQ 2024

medium

chemistry ID: mht-cet-

$Which of the following is a homopolymer?$

1

$Polystyrene$

2

$Nylon$

3

$Bakelite$

4

$PVC$

Official Solution

Correct Option: $(1)$

$A homopolymer is a polymer that consists of only one type of monomer. Among the options: - Nylon-6,6 is a copolymer made from two different monomers: hexamethylenediamine and adipic acid. - Polystyrene is a homopolymer formed from the polymerization of styrene monomers. - Bakelite is a thermosetting polymer made from phenol and formaldehyde, so it is not a homopolymer. - Teflon is a polymer made from tetrafluoroethylene monomers, but it is typically considered a polymer of one type of monomer, thus it is also a homopolymer. Therefore, polystyrene is the correct answer as it is a homopolymer formed from styrene.$

42

PYQ 2025

medium

chemistry ID: mht-cet-

$Which is the correct increasing order of atomic radii of Na, K, Mg, Rb ?$

1

$Mg$

2

$Mg$

3

$Mg$

4

$Na$

Official Solution

Correct Option: $(2)$

$Step 1: Periodic Trends - Across a period: Atomic radius decreases. - Down a group: Atomic radius increases. Step 2: Positioning - Period 3: Mg (Group 2), Na (Group 1). So, . - Group 1: Na, K, Rb. So, . Step 3: Conclusion Combining the trends: . Final Answer: (B)$

43

PYQ 2025

medium

chemistry ID: mht-cet-

$Which from following cations develops lowest value of spin only magnetic moment?$

1

2

3

4

Official Solution

Correct Option: $(1)$

$Concept: The spin-only magnetic moment is given by: where = number of unpaired electrons. Thus, magnetic moment depends only on number of unpaired electrons . Lower the number of unpaired electrons â lower magnetic moment. Step 1: Find electronic configurations of ions. V (Z = 23): Cr (Z = 24): Mn (Z = 25): Fe (Z = 26): Step 2: Count unpaired electrons. â 2 unpaired electrons â 3 unpaired electrons â 5 unpaired electrons â 4 unpaired electrons Step 3: Compare magnetic moments. So smallest gives smallest magnetic moment. Step 4: Conclusion.$

44

PYQ 2025

medium

chemistry ID: mht-cet-

$Nitric oxide reacts with H according to reaction. 2NO + 2H N + 2H O . Identify the correct relationship for consumption of reactant and formation of product.$

1

2

3

4

Official Solution

Correct Option: $(2)$

$Step 1: Rate Expression For reaction : Step 2: Apply to Reaction Step 3: Verification - Option (B) says . This matches the derived expression. Final Answer: (B)$

45

PYQ 2026

easy

chemistry ID: mht-cet-

$Which of the following is a monomer of Nylon 6,6?$

1

$Caprolactam$

2

$Adipic acid$

3

$Glycine$

4

$Vinyl chloride$

Official Solution

Correct Option: $(2)$

$Step 1: Understanding the Concept: Nylon 6,6 is a type of polyamide, which is a synthetic polymer formed by step-growth condensation polymerization. The numbers "6,6" in its name refer to the number of carbon atoms present in its two constituent monomers. Step 2: Key Formula or Approach: The approach is to identify the specific chemical monomers required to synthesize the Nylon 6,6 polymer chain. We need to evaluate the given options to find either the diamine or the dicarboxylic acid used in this synthesis. Step 3: Detailed Explanation: Nylon 6,6 is manufactured by the polycondensation of two specific monomers. The first monomer is a six-carbon diamine known as hexamethylenediamine . The second monomer is a six-carbon dicarboxylic acid known as adipic acid . Let us briefly review the incorrect options provided. Option (A) Caprolactam is the single monomer used for producing Nylon 6, not Nylon 6,6. Option (C) Glycine is a natural amino acid and is not utilized in the production of commercial nylon polymers. Option (D) Vinyl chloride is the monomer used to manufacture polyvinyl chloride (PVC) via addition polymerization. Therefore, Adipic acid is the correct monomer from the given list. Step 4: Final Answer: Adipic acid is a monomer of Nylon 6,6.$

46

PYQ 2026

medium

chemistry ID: mht-cet-

$What are the repeating monomer units of Nylon-6,6?$

1

$Ethylene glycol and Terephthalic acid$

2

$Adipic acid and Hexamethylenediamine$

3

$Caprolactam$

4

$Styrene$

Official Solution

Correct Option: $(2)$

$Concept: Nylon-6,6 is a synthetic polyamide polymer produced by a condensation polymerization reaction between a dicarboxylic acid and a diamine. During the reaction, monomers join together with the elimination of small molecules such as water. The numbers in the name Nylon-6,6 indicate the number of carbon atoms present in each of the two monomers used to form the polymer. Step 1: Identify the monomers involved Nylon-6,6 is formed from the following two monomers: • Adipic acid, which contains 6 carbon atoms. • Hexamethylenediamine, which also contains 6 carbon atoms. Step 2: Understand the polymerization reaction During condensation polymerization, the carboxyl group () of adipic acid reacts with the amine group () of hexamethylenediamine. This reaction forms an amide linkage () while releasing a molecule of water. Step 3: Formation of repeating units The repeating unit of Nylon-6,6 contains amide bonds that connect alternating segments derived from adipic acid and hexamethylenediamine. These repeating units give nylon its strong and durable polymer structure. Conclusion: Therefore, the repeating monomer units used to produce Nylon-6,6 are Adipic acid and Hexamethylenediamine .$

47

PYQ 2026

medium

chemistry ID: mht-cet-

$What are the monomers of Bakelite?$

1

$Ethylene and Styrene$

2

$Phenol and Formaldehyde$

3

$Vinyl chloride and Ethylene$

4

$Urea and Formaldehyde$

Official Solution

Correct Option: $(2)$

$Concept: Bakelite is one of the first synthetic plastics and belongs to the class of thermosetting polymers . It is formed through a condensation polymerization reaction between phenol and formaldehyde. In condensation polymerization, small molecules (such as water) are eliminated while forming the polymer chain. Step 1: Identify the type of polymer. Bakelite is a phenol-formaldehyde resin produced by condensation polymerization. Step 2: Identify the monomers involved. The monomers used are Step 3: State the final answer. Thus, the monomers of Bakelite are$

48

PYQ 2026

medium

chemistry ID: mht-cet-

$Which of the following polymers is a copolymer: Buna-S, Polythene, or PVC?$

1

$Polythene$

2

$PVC$

3

$Buna-S$

4

$All of these$

Official Solution

Correct Option: $(3)$

$Concept: Polymers are classified based on the number of different monomers used in their formation. Homopolymer: Formed from only one type of monomer. Copolymer: Formed from two or more different monomers. Step 1: {Examine each polymer.} Polythene: Formed from a single monomer, ethene . Thus, it is a homopolymer . PVC (Polyvinyl Chloride): Formed from one monomer, vinyl chloride . Thus, it is also a homopolymer . Buna-S: Buna-S is produced by copolymerization of: Butadiene Styrene Since it is formed from two different monomers, it is a copolymer . Step 2: {Identify the correct option.} Therefore, the copolymer among the given polymers is$

49

PYQ 2026

medium

chemistry ID: mht-cet-

$The monomer used to prepare Orlon is$

1

$Vinyl chloride$

2

$Tetrafluoroethylene$

3

$Acrylonitrile$

4

$Styrene$

Official Solution

Correct Option: $(3)$

$Concept: Many synthetic fibres are produced through addition polymerization of vinyl monomers. Orlon is the commercial name of polyacrylonitrile (PAN), a polymer formed by the polymerization of acrylonitrile. Step 1: {Identify the polymer.} Orlon is a synthetic fibre made from polyacrylonitrile . Therefore, its repeating unit comes from the monomer acrylonitrile . Step 2: {Write the structure of the monomer.} Acrylonitrile (also called vinyl cyanide) has the structure: Step 3: {Polymerization reaction.} During addition polymerization, many molecules of acrylonitrile combine to form polyacrylonitrile: This polymer is commercially known as Orlon . Step 4: {Conclusion.} Hence, the monomer used in the preparation of Orlon is:$

50

PYQ 2026

medium

chemistry ID: mht-cet-

$What are the monomers used to synthesize Bakelite?$

1

$Ethene and Styrene$

2

$Phenol and Formaldehyde$

3

$Urea and Formaldehyde$

4

$Ethylene glycol and Terephthalic acid$

Official Solution

Correct Option: $(2)$

$Concept: Bakelite is one of the earliest synthetic polymers and belongs to the class of thermosetting plastics. Thermosetting polymers become permanently hard after heating and cannot be remelted. Bakelite is produced through a condensation polymerization reaction between phenol and formaldehyde. In condensation polymerization, small molecules such as water are eliminated while forming the polymer chain. Step 1: Identify the monomers involved. The two monomers that react to form Bakelite are: • Phenol • Formaldehyde Step 2: Polymer formation mechanism. Phenol reacts with formaldehyde under acidic or basic conditions to first form intermediate products such as novolac or resol. Further heating and cross-linking of these intermediates produces Bakelite, which is a rigid three-dimensional polymer network. Step 3: Properties and uses. Due to its strong cross-linked structure, Bakelite has high thermal stability, good electrical insulation properties, and high mechanical strength. Therefore, it is widely used in electrical switches, handles of utensils, and insulating components.$

51

PYQ 2026

medium

chemistry ID: mht-cet-

$Which of the following polymers is prepared by condensation polymerization: Nylon-6,6 or Polythene?$

1

$Polythene$

2

$Nylon-6,6$

3

$Both$

4

$None of these$

Official Solution

Correct Option: $(2)$

$Concept: Polymers are classified based on their method of formation: Addition polymerization: Monomers join together without elimination of any small molecule. Condensation polymerization: Monomers combine with elimination of small molecules such as,, or . Step 1: {Consider Polythene.} Polythene is formed by addition polymerization of ethene. No small molecule is eliminated during this reaction. Hence, it is an addition polymer . Step 2: {Consider Nylon-6,6.} Nylon-6,6 is formed from hexamethylenediamine and adipic acid. During polymer formation, water molecules are eliminated. Thus, Nylon-6,6 is formed by condensation polymerization . Step 3: {Conclusion.} Therefore, the polymer prepared by condensation polymerization is:$

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About Polymers - MHT-CET

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