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Chemistry M.C.Q (1 Marks)

Polymers · CBSE STD 12 Science (CBSE - English Medium). 163 questions.

Questions · Page 2 of 4

M.C.Q (1 Marks)

MCQ 511 Mark
Which of the following is an example of condensation polymers?
  • A
    Polythene
  • B
    Orlon
  • ✓
    Terylene
  • D
    None of these
Answer
Correct option: C.
Terylene
Condensation polymerization: This type of polymerization generally involves a repetitive condensation reactions between two bi$-$functional monomers. These poly$-$condensation reactions may result in the loss of simple molecule as water, alcohol etc.
Example: Terylene $($as shown in the figure$).$
Which of the following is an example of condensation polymers?
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MCQ 521 Mark
Pick out the incorrect statement amongst the following.
  • ✓
    Nylon clothing can stand high temperature and are therefore good to wear in summers.
  • B
    Thermosetting plastics do not become soft on heating.
  • C
    Addition polymers are formed without the elimination of by$-$product molecules.
  • D
    Natural rubber is obtained as latex from rubber trees.
Answer
Correct option: A.
Nylon clothing can stand high temperature and are therefore good to wear in summers.
Nylon is very much suitable for hosiery and the knitted fabrics because of its smoothness, light weight and high strength. Nylon is a lustrous fibre.
Thermoset materials are generally stronger than thermoplastic materials due to this three$-$dimensional network of bonds $($cross$-$linking$),$ and are also better suited to high-temperature applications up to the decomposition temperature.
Natural rubber is obtained as latex from rubber trees.
An addition polymer is a polymer which is formed by an addition reaction, where many monomers bond together via rearrangement of bonds without the loss of any atom or molecule.
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MCQ 531 Mark
Vulcanisation makes rubber $.......$
$a.$ More elastic.
$b.$ Soluble in inorganic solvent.
$c.$ Crystalline.
$d.$ More stiff.
  • A
    $a$ and $b$
  • B
    $a$ and $c$
  • C
    $b$ and $c$
  • ✓
    $a$ and $d$
Answer
Correct option: D.
$a$ and $d$
To improve upon physical properties of natural rubber a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between $373K$ to $415K.$ On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.
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MCQ 541 Mark
The plastic product which can be remoulded is:
  • A
    Bakelite
  • B
    Melamine
  • ✓
    Polyethene
  • D
    Polycot
Answer
Correct option: C.
Polyethene
Chain growth polymerization is involved in the manufacture of polymers such as polyethylene. Free radical mechanism for ethylene takes place at high temperature and pressure which can be remoulded by its repeating carbon chain.
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MCQ 551 Mark
Natural rubber is not used in making footwear for polar regions because:
  • A
    Natural rubber becomes soft at temperature lower than $10^\circ C.$
  • ✓
    Natural rubber becomes brittle at temperature lower than $10^\circ C.$
  • C
    Natural rubber melts at temperature lower than $10^\circ C.$
  • D
    Natural rubber becomes stronger at temperature lower than $10^\circ C.$
Answer
Correct option: B.
Natural rubber becomes brittle at temperature lower than $10^\circ C.$
Natural rubber is a thermoplastic. It becomes soft and sticky when heated at high temperature $($lower than $62^\circ C)$ and brittle at low temperature $(10^\circ C).$
So that's why natural rubber is not used in making footwear for the polar region.
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MCQ 561 Mark
The commercial name of polyacrylonitrile is $........$
  • A
    Dacron.
  • ✓
    Orlon $($acrilan$).$
  • C
    $\text{PVC}.$
  • D
    Bakelite.
Answer
Correct option: B.
Orlon $($acrilan$).$
The commercial name of polyacrylonitrile is Orion or acrilan.
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MCQ 571 Mark
Which of the following type of forces are present in vulcanized rubber?
  • ✓
    Weakest intermolecular forces
  • B
    Hydrogen bonding
  • C
    Three dimensional network of bonds
  • D
    Metallic bonding
Answer
Correct option: A.
Weakest intermolecular forces
Vulcanised rubber is highly elastic, so weakest intermolecular forces present in it.
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MCQ 581 Mark
Which of the following happens in initiation step of the free radical polymerisation?
  • ✓
    Decomposition of initiator.
  • B
    Renewal of inhibitor.
  • C
    Addition of monomer molecules to the growing chains.
  • D
    Disproportionation.
Answer
Correct option: A.
Decomposition of initiator.
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MCQ 591 Mark
Bubble gum contains $.......$
  • A
    Thiokol rubber
  • ✓
    Styrene $-$ butadiene rubber
  • C
    Isobutylen $-$ isoprene rubber
  • D
    Acrylonitrile $-$ butadiene rubber
Answer
Correct option: B.
Styrene $-$ butadiene rubber
Bubble gum is a soft cohesive substance made up of butadiene$-$based synthetic rubber because it is cheaper to manufacture.
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MCQ 601 Mark
The method preferred for determining the molecular weight of a polymer is $.........$
  • ✓
    Osmotic pressure
  • B
    Gas density
  • C
    Lowering of freezing point
  • D
    Direct weighing of a single molecule
Answer
Correct option: A.
Osmotic pressure
Osmotic pressure method is the best method for the determination of molecular weight of polymers and proteins, since osmotic pressure, though very small, is measurable.
On the other hand, in other colligative properties $\ce{(\triangle Tb​, \triangle Tf​, \triangle p/po)},$ the difference is very small and cannot be measured.
Morever, in osmotic pressure method, heating is not required. While in other methods, heating is required which changes the properties of polymers and proteins.
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MCQ 611 Mark
Which of the following polymers, need atleast one diene monomer for their preparation?
Dacron.
Buna$-S.$
Neoprene.
Novolac.
  • A
    $a$ and $b$
  • B
    $b$ and $c$
  • ✓
    $a$ and $c$
  • D
    $b$ and $d$
Answer
Correct option: C.
$a$ and $c$
Buna$-S$ and neoprene are two such polymers which need at least one diene monomer for their preparation.
  1. Buna$-S$ is prepared by copolymerization of $1, 3-$butadierie and styrene.
  2. Neoprene is prepared by polymerisation of chloroprene.
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MCQ 621 Mark
Plastics are:
  • A
    Salts
  • B
    Acids
  • ✓
    Polymers
  • D
    Solvents
Answer
Correct option: C.
Polymers
Plastics are polymers formed from small molecular fragments which are known as monomers and plastic is the macromolecular fragment.
All polymers are not plastics but all plastics are polymers.
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MCQ 631 Mark
Sulphur is used for vulcanization of rubber to make it:
  • A
    Hard
  • ✓
    Elastic
  • C
    Malleable
  • D
    Soft
Answer
Correct option: B.
Elastic
Sulphur is used for vulcanization of rubber to make it more strong, tough and elastic.
Note: Natural rubber is soft, sticky and has less tensile strength.
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MCQ 641 Mark
Which of the following is resistant to petrol, lubricating oils and organic solvents?
  • A
    Nitrile rubber
  • B
    Buna $- N$
  • C
    $\text{GRN}$
  • ✓
    All of these
Answer
Correct option: D.
All of these
All the three nitrile rubber, buna $n$ and $\text{grn}$ are resistant to petrol, lubricant oil and organic solvent.
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MCQ 651 Mark
Which of the following kind of polymers are known for their high crystallinity?
  • A
    Syndiotactic
  • B
    Atactic
  • ✓
    Isotactic
  • D
    None of the mentioned
Answer
Correct option: C.
Isotactic
There is high steric regularity in isotactic polymers which fosters close packing of molecular chains. Thus, they are highly crystalline.
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MCQ 661 Mark
Dacron is obtained by the condensation polymerisation of:
  • ✓
    Dimethyl terephthalate and ethylene glycol.
  • B
    Terephthalic acid and formaldehyde.
  • C
    Phenol and phthalic acid.
  • D
    Phenol and formaldehyde.
Answer
Correct option: A.
Dimethyl terephthalate and ethylene glycol.
Dacron is obtained by the condensation polymerisation of dimethyl terephthalate and ethylene glycol.
Dacron is polyester and is also called terylene.
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MCQ 671 Mark
Rubber is hardened for making tyres by:
  • A
    Adding $\mathrm{H}_2$
  • ✓
    Adding carbon black
  • C
    Saturating it
  • D
    All of the above
Answer
Correct option: B.
Adding carbon black
Carbon black is used in various formulations with different rubber types to customize the performance properties of tyres.
Different grades of carbon black are used to optimize properties like handling,tradewear, fuel mileage and abrasion resistance.
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MCQ 681 Mark
Synthetic polymer that resembles natural rubber is:
  • A
    Chloroprene
  • B
    Isoprene
  • ✓
    Neoprene
  • D
    Glyptal
Answer
Correct option: C.
Neoprene
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MCQ 691 Mark
Which of the following is a way to dispose non$-$biodegradable materials?
  • A
    Recycling
  • B
    Land fill
  • C
    Incineration
  • ✓
    All of above
Answer
Correct option: D.
All of above
Polymers can be recycled mechanically or chemically. In land fill polymers are buried in the ground so that they do not accumulate and cause pollution. Incineration is heating at high temperature.
Heat energy released by polymers is used to generate electricity.
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MCQ 701 Mark
Bakelite polymer is formed by the polymerization of:
  • A
    Methanol and salicyladehyde.
  • ✓
    Methanal and hydroxy benzene.
  • C
    Ethanal and hydroxy benzene.
  • D
    Ethanal and cinnamic acid.
Answer
Correct option: B.
Methanal and hydroxy benzene.
Bakelite is a thermosetting phenol formaldehyde resin, formed from elimination reaction of phenol with formaldehyde.
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MCQ 711 Mark
Which of the following is used in making automobile tyres and foot wear?
  • ✓
    Vulcanised rubber
  • B
    Neoprene
  • C
    Plexi glass
  • D
    Glyptal
Answer
Correct option: A.
Vulcanised rubber
Vulcanised rubber is used in making automobile tyres and foot wear.
Heating of rubber with sulphur is called as vulcanisation. It makes the rubber hard and more flexible.
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MCQ 721 Mark
Which type of polymer is natural rubber?
  • A
    Condensation polymer
  • ✓
    Addition polymer
  • C
    Coordination polymer
  • D
    None of the above
Answer
Correct option: B.
Addition polymer
Natural rubber is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree.
Natural rubber is the polymer of isoprene $(2-$methyl$-1,3-$butadiene$).$
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MCQ 731 Mark
Polymer formation form monomers starts by:
  • ✓
    Condensation reaction between monomers.
  • B
    Conversion of monomer to monomer ions by protons.
  • C
    Coordination reaction between monomers.
  • D
    Hydrolysis of monomers.
Answer
Correct option: A.
Condensation reaction between monomers.
Polymerization occurs by a condensation reaction, which is a chemical reaction in which two molecules or moieties $($functional groups$)$ combine to form a larger molecule, together with the loss of a small molecule such as water$, \text{HCl}$ etc.
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MCQ 741 Mark
Which of the following correctly describes teflon?
  • A
    It is an antiseptic.
  • B
    It is an antifreeze.
  • ✓
    It is an anti$-$corrosive plastic.
  • D
    All of the above
Answer
Correct option: C.
It is an anti$-$corrosive plastic.
Teflon $($tetrafluoroethylene$)$ is an anti$-$corrosive plastic. It is flexible and inert to solvent acids.
Hence, it is used in making non$-$stick utensils.
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MCQ 751 Mark
The product that you would expect to obtain from catalytic hydrogenation of natural rubber is $........$
  • A
    Syndiotactic
  • ✓
    Atactic
  • C
    Isotactic
  • D
    Either atatic or isotatic
Answer
Correct option: B.
Atactic
These are the polymers formed by free radical mechanisms with a random orientation of groups.
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MCQ 761 Mark
Polymer used in bullet proof glass is:
  • A
    Lexan
  • ✓
    $\text{PMMA}$
  • C
    Nomex
  • D
    Kevlar
Answer
Correct option: B.
$\text{PMMA}$
Lexan is a kind of polycarbonate i.e. thermosetting polymers containing carbonate groups.
They are strong, tough materials, and are optically transparent.
This is why a laminated polycarbonate $($Lexan$)$ is used to make bulletproof glass.
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MCQ 771 Mark
Which of the following is monomer of natural rubber?
  • ✓
    Isoprene
  • B
    Chloroprene
  • C
    Caprolactum
  • D
    Styrene
Answer
Correct option: A.
Isoprene
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MCQ 781 Mark
A polymer used in paints is:
  • A
    Nomex
  • B
    Thiokol
  • C
    Saran
  • ✓
    Glyptal
Answer
Correct option: D.
Glyptal
Nomex is used in protective clothing for race car drivers and firefighters.
Thiokol is used in rubber.
Saran is used in bumpers.
Glyptal used in the manufacture of paints and lacquers.
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MCQ 791 Mark
In fractional distillation of petroleum, the vapours with highest boiling point:
  • A
    Condense in uppermost portion.
  • ✓
    Condense in lowermost portion.
  • C
    Condense in middle portion.
  • D
    Do not condense.
Answer
Correct option: B.
Condense in lowermost portion.
In fractional distillation of petroleum, the vapours with highest boiling point condense in lowermost portion.
As the vapors of highest boiling point evaporates later and condenses later at lower portion.
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MCQ 801 Mark
A polymer is formed by:
  • A
    Hydration
  • B
    Methylation
  • C
    Hydrolysis
  • ✓
    Dehydration synthesis
Answer
Correct option: D.
Dehydration synthesis
A polymer is formed by Dehydration synthesis means removal of water molecule.
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MCQ 811 Mark
Which polymer is used in controlled drugs capsules?
  • A
    $\text{SBR}$
  • B
    $\text{PTFE}$
  • ✓
    $\text{PHBV}$
  • D
    $\text{PAN}$
Answer
Correct option: C.
$\text{PHBV}$
$\text{PHBV}$ helps in controlled release of drugs, medical implants and repairs, speciality packaging orthopaedic devices and manufacturing bottles.
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MCQ 821 Mark
Which of the following polymers of glucose is stored by animals?
  • A
    Cellulose.
  • B
    Amylose.
  • C
    Amylopectin.
  • ✓
    Glycogen.
Answer
Correct option: D.
Glycogen.
Glycogen is a polymer of glucose found in lever, brain and muscles of animals.
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MCQ 831 Mark
Which among the following is not a natural polymer?
  • A
    Wool
  • B
    Silk
  • C
    Rubber
  • ✓
    $\text{PVC}$
Answer
Correct option: D.
$\text{PVC}$
There are two types of polymers: synthetic and natural.
Synthetic polymers are derived from petroleum oil and made by scientists and engineers.
Examples of synthetic polymers include nylon, polyethene, polyester, Teflon, and epoxy.
Polyvinyl chloride, commonly abbreviated $\text{PVC},$ is the third$-$most widely produced synthetic plastic polymer.
Natural polymers occur in nature and can be extracted. Examples of naturally occurring polymers are silk, wool$, \text{DNA},$ cellulose and proteins and rubber.
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MCQ 841 Mark
Super glue or crazy glue is:
  • A
    Polymethyl methacrylate
  • B
    Polyethyl acrylate
  • ✓
    Polymethyl α-cyanoacrylate
  • D
    Polyethyl methacrylate
Answer
Correct option: C.
Polymethyl α-cyanoacrylate
Super glue is poly$($methyl $\alpha -$cyanoacrylate$).$
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MCQ 851 Mark
Polymer obtained by condensation polymerization is:
  • A
    Polythene
  • B
    Teflon
  • C
    $\text{PVC}$
  • ✓
    Bakelite
Answer
Correct option: D.
Bakelite
Bakelite $($as shown in the figure$)$ is formed by condensation reaction of phenol with formaldehyde.
Polythene is an addition polymer formed by addition of ethene monomer.
Teflon is an addition polymer formed by carbon tetraflouride.
Polyvinyl chloride $\text{(PVC)}$ is formed by addition of vinyl chloride molecules. It is an addition polymer.
Polymer obtained by condensation polymerization is :
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MCQ 861 Mark
Bakelite is a polymer of:
  • A
    Benzaldehyde and phenol
  • B
    Acetaldehyde and phenol
  • ✓
    Formaldehyde and phenol
  • D
    Formaldehyde and benzyl alcohol
Answer
Correct option: C.
Formaldehyde and phenol
Bakelite is a cross $-$ linked condensation polymer of phenol $\left(\mathrm{C}_6 \mathrm{H}_5-\mathrm{OH}\right)$ and formaldehyde $\text{(HCHO)}.$ It is thermosetting plastic used for making electrical switches and switch boards.
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MCQ 871 Mark
Teflon, a polymer of tetrafluoroethylene, is an excellent plastic material for films and coatings. Which of the following is not the property of Teflon?
  • ✓
    It is unaltered by radiation
  • B
    It can withstand high temperatures
  • C
    It is one of the most chemically$-$resistant plastic in the world
  • D
    It is an ideal insulator for high$-$frequency fittings
Answer
Correct option: A.
It is unaltered by radiation
$\text{PTFE}\ ($Poly tetra fluoro ethylene$)$ is very sensitive and is therefore not suitable for applications involving exposure of any radiation as it will degrade.
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MCQ 881 Mark
Emulsions of polyvinyl acetate are used in?
  • A
    Polishes
  • B
    Firecrackers
  • C
    Crayons
  • ✓
    Latex paints
Answer
Correct option: D.
Latex paints
Polyvinyl acetate is synthesized by the emulsion polymerization of vinyl acetate monomer $\text{(VAM)}.$
Polyvinyl acetate serves as the film$-$forming ingredient in water$-$based $($latex$)$ paints.
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MCQ 891 Mark
What are polymers?
  • A
    Macromolecules composed of many repeated sub units.
  • B
    Monomers bonded together in a long chain.
  • ✓
    Both $A$ and $B.$
  • D
    None of the above.
Answer
Correct option: C.
Both $A$ and $B.$
A polymer is a substance or material consisting of very large molecules, or macromolecules, composed of many repeating subunits.
The word polymer comes from the Greek words for “many parts.” Each of those parts is scientists call a monomer $($which in Greek means “one part”$).$ Think of a polymer as a chain, with each of its links a monomer.
Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life.
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MCQ 901 Mark
The abbreviation $\text{PDI}$ refers to $.........$
  • A
    Name of the polymer
  • ✓
    Polydispersity index of the polymer
  • C
    Application of the polymer
  • D
    Polydiagonal index
Answer
Correct option: B.
Polydispersity index of the polymer
The polydispersity index $\text{(PDI)}$ is a measure of the distribution of molecular mass in a given polymer sample.
The $\text{PDI}$ calculated is the weight average molecular weight divided by the number average molecular weight.
It indicates the distribution of individual molecular masses in a batch of polymers.
The $\text{PDI}$ has a value equal to or greater than $1,$ but as the polymer chains approach uniform chain length, the $\text{PDI}$ approaches unity.
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MCQ 911 Mark
Trans-form of rubber is called  $........$
  • A
    Isoprene
  • B
    Neoprene
  • ✓
    Gutta percha
  • D
    Glyptal
Answer
Correct option: C.
Gutta percha
Gutta percha is called trans-form of rubber, as it is a polymer of isoprene, the basic sub unit in natural rubber.
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MCQ 921 Mark
Which of the following polymers are condensation polymers?
$a.$ Bakelite.
$b.$ Teflon.
$c.$ Butyl rubber.
$d.$ Melamine formaldehyde resin.
  • A
    $a$ and $b$
  • B
    $a$ and $c$
  • C
    $b$ and $c$
  • ✓
    $a$ and $d$
Answer
Correct option: D.
$a$ and $d$
Bakelite is a condensation polymer of phenol and formaldehyde. Melamine formaldehyde resin is a condensation polymer of melamine $(2, 4, 6-$triamino$-1, 3, 5-$triazine$)$ and formaldehyde.
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MCQ 931 Mark
Which polymer is used in the preparation of hose $-$ pipe?
  • A
    Orlon
  • B
    Polystyrene
  • ✓
    Teflon
  • D
    Altame
Answer
Correct option: C.
Teflon
Teflon is used to prepare hose$-$pipe. Teflon inner layer excels in corrosion resistance and ensures flexibility.
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MCQ 941 Mark
Which of the following is incorrect regarding natural rubber?
  • A
    It is cis$-$polyisoprene
  • B
    It is amorphous in nature
  • ✓
    It has syndiotactic stereochemistry
  • D
    Molecules of rubber have coiled conformation
Answer
Correct option: C.
It has syndiotactic stereochemistry
Rubber has isotactic stereochemistry, not syndiotactic.
Tacticity refers to the orderliness of succession of configurational repeating units in the main chain of a macromolecule.
This is an application of stereochemistry as it concerns the spatial arrangement of substituent groups.
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MCQ 951 Mark
Which of the following polymer is not an addition polymer?
  • A
    Teflon
  • ✓
    $\text{BUNA - N}$
  • C
    $\text{PAN}$
  • D
    Propylene
Answer
Correct option: B.
$\text{BUNA - N}$
$\text{BUNA - N}$ is formed by removal of water molecule so it is condensation polymer.
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MCQ 961 Mark
Nylon threads are made of $.......$
  • A
    Polyethylene polyemer
  • B
    Polyvinyl polymer
  • C
    Polyester polymer
  • ✓
    Polyamide polymer
Answer
Correct option: D.
Polyamide polymer
Nylon threads are polymer of polyamides obtained by condensing amides and /or carboxylic acids
Examples are nylon $- 6,$ nylon $- 6, 6.$
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MCQ 971 Mark
Which of the following is correct about cellulose?
  • A
    Natural polymer
  • B
    Synthetic polymer
  • C
    Semi synthetic polymer
  • ✓
    Natural monomer
Answer
Correct option: D.
Natural monomer
Cellulose fibers can be obtained from the bark, wood or leaves of plants, or from a plant$-$based material. Cotton is a polymer of cellulose. It is made up of large number of glucose units.
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MCQ 981 Mark
Plexiglass is a polymer of $......$
  • A
    Acrylic acid
  • B
    Methylacrylate
  • ✓
    Methyl methacrylate
  • D
    Methyl propacrylate
Answer
Correct option: C.
Methyl methacrylate
Plexiglass is a very important commercial polymer because of its high resisting properties.
It is a polymer of methyl methacrylate.
The structure of the methylmethacrylate is given above.
Plexiglass is a polymer of . | Chemistry Questions
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MCQ 991 Mark
Which one of the following statements is not true?
  • A
    Buna$-S$ is a copolymer of butadiene and styrene.
  • B
    Natural rubber is a $1, 4-$polymer of isoprene.
  • C
    In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger.
  • ✓
    Natural rubber has the trans-configuration at every double bond.
Answer
Correct option: D.
Natural rubber has the trans-configuration at every double bond.
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MCQ 1001 Mark
Which of the folloiwng are characteristics of thermosetting polymers?
$a.$ Heavily branched cross linked polymers.
$b.$ Linear slightly branched long chain molecules.
$c.$ Become infusible on moulding so cannot be reused.
$d.$ Soften on heating and harden on cooling, can be reused.
  • A
    $a$ and $b$
  • B
    $b$ and $c$
  • ✓
    $a$ and $c$
  • D
    $a$ and $d$
Answer
Correct option: C.
$a$ and $c$
Thermosetting polymers: These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross linking in moulds and again become infusible. These cannot be reused.
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M.C.Q (1 Marks) - Page 2 - Chemistry STD 12 Science Questions - Vidyadip