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CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 6 - MCQExams.com
CBSE
Class 12 Engineering Chemistry
Polymers
Quiz 6
Super glue or crazy glue is:
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0%
polymethyl methacrylate
0%
polyethyl acrylate
0%
polymethyl $$\alpha$$-cyanoacrylate
0%
polyethyl methacrylate
Explanation
Super glue is poly(methyl $$\alpha$$-cyanoacrylate).
Polypropylene can be obtained by polymerisation of :
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$$CH_2=CH-CH_3$$
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$$CH_2=CH_2$$
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$$CH_4$$
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$$CH_3-CH_3$$
Explanation
$$nCH_3-HC=CH_2\longrightarrow \underset{\text{porypropylene}}{(-CH_2-\underset{CH_3}{\underset{|}{C}H}-)_n}$$
Hence, polypropylene must have its monomeric unit derived from propylene (3 carbon unit).
Hence the correct option is A.
The monomer for the given compound is:
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2-methylpropene
0%
Styrene
0%
Propylene
0%
Ethene
Explanation
The monomer of the polymer is 2-methyl propene or isobutene.
Which of the following statements is not true about low density polythene?
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Tough
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Highly branched structure
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Poor conductor of electricity
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Hard
In elastomer, intermolecular forces are:
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Nil
0%
Weak
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Strong
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Very strong
Explanation
Rubber-like solids with elastic properties are called elastomers.
Polymer chains are held together in these materials by relatively weak inter-molecular bonds i.e. weak Van-der Waals interaction, which permit the polymers to stretch in response to macroscopic stresses.
Hence, option $$B$$ is correct.
Which type of polymer is natural rubber?
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Condensation polymer
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Addition polymer
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Coordination polymer
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None of the above
Explanation
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).
Hence, option B is correct.
Perlon is:
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terelene
0%
nylon-6
0%
rubber
0%
polyester
Explanation
Another name of Perlon is Nylon $$-6$$.
Monomer is $$\longrightarrow$$ Caprolactam.
Neoprene is a polymer of:
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isoprene
0%
butadiene
0%
styrene
0%
chloroprene
Explanation
In other words, neoprene is made through a chemical reaction using chloroprene. It is chloroprene that binds all the molecules of this reaction together, leaving us with polychloroprene chips. These chips are melted and mixed together with foaming agents and carbon pigments, and then baked in an oven to make it expand.
Structure of (monomer unit of) natural rubber is
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0%
0%
0%
0%
$$(-CH_2-CH_2-)_n$$
Which of the following is not a biopolymer?
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Starch
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Rubber
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Proteins
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Nucleic acids
Explanation
Rubber is a natural polymer but not a natural biopolymer. While starch protein and nucleic acid are the Biopolymer.
A polyamide synthetic polymer prepared by prolonged heating of caprolactum, is:
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nylon-6, 6
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nylon-6
0%
nylon-6, 10
0%
glyptal
Explanation
Nylon 6 is obtained by heating of caprolactam with water at higher temperature, The correct options is B.
Which of the following is used to make non-stick cook-wares?
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Polyvinyl chloride
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Polytetra fluoro ethylene
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Polystyrene
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Polyethylene terephthalate
Dacron is an example of:
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polyamide
0%
polypropylene
0%
polyurethane
0%
polyester
Explanation
The polyester Dacron and the polyamide Nylon 6,6, are two examples of synthetic condensation polymers, also known as step-growth polymers.
Buna-S is a polymer of:
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butadiene only
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butadiene and nitrile
0%
styrene only
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butadiene and styrene
$$[-NH(CH_2)_6NHCO(CH_2)_4CO-]_n$$ is a:
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thermosetting polymer
0%
homopolymer
0%
copolymer
0%
addition polymer
Which of the following is a biodergradable polymer?
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Polythene
0%
PVC
0%
Bakelite
0%
PHBV
Which one of the following statements is not true?
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Buna-S is a co-polymer of butadiene and styrene
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Natural rubber is a 1, 4-polymer of isoprene
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In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger
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Natural rubber has the trans-configuration at every double bond
Buna-N synthetic rubber is a co-polymer of
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0%
0%
$$H_2C=CH-CH=CH_2$$ and $$H_5C_6-CH=CH_2$$
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$$H_2C=CH-CN$$ and $$H_5C=CH-CH=CH_2$$
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The polymer of natural rubber is
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all trans isoprene
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Buna-N
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all cis isoprene
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none of these
The raw material used in nylon-6 is:
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adipic acid
0%
phthalic acid
0%
ethylene glycol
0%
caprolactum
Mark out the most unlike form of polymerization of $$H_2C=CH-CH=CH_2$$
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0%
0%
0%
0%
Which is not a polymer?
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Sucrose
0%
Enzyme
0%
Starch
0%
Teflon
Condensation product of caprolactum is:
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nylon-6
0%
nylon-6,6
0%
nylon-60
0%
nylon-6,10
Identify $$X$$ in the reaction.
$$CHCl_3 \xrightarrow[HF]{SbF_3} CHF_2Cl \overset{1070\, K}{\rightarrow} (X)+2HCl$$
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$$F_2C=CF_2$$
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$$ClFC=CFCl$$
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$$F_2C=CFCl$$
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$$F_2C=CCl_2$$
Explanation
When chloroform is treated with antimony trifluoride and $$HF$$, 2 chlorine atoms are replaced with 2$$ F$$ atoms.
When $$\displaystyle CHF_2Cl $$ is heated to 1070 K, terafluoroethylene (compound X) is obtained.
$$\displaystyle 2CHF_2Cl \xrightarrow {1070K} F_2C=CF_2 $$
The characteristics of condensation polymerization are given below:
I. only C-C linkages present in the polymer structure
II. use of bifunctional or polyfunctional monomers
III. elimination of a small byproduct molecule
Which of the following is true?
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I, II, III
0%
Only III
0%
I and II
0%
II and III
Explanation
Besides $$C-C$$ linkages, polymer structure also contains atoms as $$O, N, etc.$$, at regular intervals in the main chain. Example: nylon, terylene and polyester etc. whereas elimination occur in condensation polymerisation and in addition polymerisation monomers are polyfunctional.
Dacron (a polymer) is obtained by the condensation polymerization of:
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Phenol and formaldehyde
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Phenol and phthalic acid
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Terepthalic acid and formaldehyde
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Dimethyl terephthalate and ethylene glycol
Explanation
The polymer of ethylene glycol and terephthalic acid is known as terylene or dacron.
Which of the following statements is not true?
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Step growth polymerisation requires a bifunctional monomer.
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Nylon 6 is an example of step-growth polymerisation
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Chain growth polymerisation includes both homopolymerisation and copolymerisation.
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Chain growth polymerisation involves homopolymerisation only.
Which step is the chain propagation step in the above mechanism?
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$$1$$
0%
$$2$$
0%
$$3$$
0%
$$4$$
Which of the following is an example of condensation polymer?
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Teflon
0%
Melamine
0%
Nylon-6
0%
BUNA-S
Which of the following has cross-linked polymer?
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Vulcanised rubber
0%
Nylon
0%
Phenol-formaldehyde resins
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Both $$A$$ and $$C$$
The structure of the polymer obtained by the following reaction is:
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0%
0%
0%
0%
The solution containing 4.0 % PVC in one litre of dioxane was found to have osmotic pressure of $$ 6.0 \times 10^{-4} $$ atm at 300 K. The molecular mass of polymer is
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0%
$$ 6.4 \times 10^2 $$
0%
$$3.0 \times 10^2 $$
0%
$$ 1.6 \times 10^5 $$
0%
$$ 5.6 \times 10^4 $$
Polymer with highest softening point is
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0%
LDPE
0%
HDPE
0%
teflon
0%
bakelite
Polymer formation from monomers starts by:
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Condensation reaction between monomers
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Coordination reaction between monomers
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Conversion of one monomer into other monomer
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Hydrolysis of monomers
Explanation
Polymer formation is caused by the condensation of 2 or more bifunctional monomers with the elimination of simple molecules like water, ammonia, alcohol etc. In these reactions, the product of each step is again a bifunctional species & the sequence of condensation goes on.
Hence, option A is correct.
Natural rubber is a polymer of isoprene (2-methyl buta-1,3-diene). If natural rubber is treated with $$O_3$$ followed by $$Zn/H_2O$$, the final product will be:
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0%
$$CH_{ 3 }-\overset { \begin{matrix} O \\ || \end{matrix} }{ C } -CH_2-CH_2-CHO$$
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$$CH_{ 3 }-CH_2-\overset { \begin{matrix} O \\ || \end{matrix} }{ C } -CH_2-CHO$$
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Which of the following polymers shows a sharp melting point?
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Butyl rubber
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Polystyrene
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Bakelite
0%
Nylon-6,6
Which of the following is an example of elastomers?
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Rubber
0%
Nylon-6,6
0%
PVC
0%
Bakelite
Natural rubber is a polymer of
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Co-cis-trans isoprene
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trans-isoprene
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cis-isoprene
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none of these
Favourable conditions for preparation of low density polythene (LDP) is:
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high $$P$$, low $$T$$
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low $$P$$, high $$T$$
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high $$P$$, high $$T$$
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low $$P$$, low $$T$$
Explanation
Low density polythene are formed from ethene at high temperature and pressure. It is of ubiquitous nature and resistant to biodegradability. It has excellent mechanical properties, barrier properties against water, light weight, low cost and high energy effectiveness.
Caprolactum is the monomer for
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Nylon -$$6$$
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Nylon $$6,6$$
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Nylon-$$2$$- Nylon-$$6$$
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Terylene
Which of the following polymer is condensation as well as cross-linked polymer?
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Bakelite
0%
Nylon-6.6
0%
Nylon-2,,Nylon-6
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Dacron
Explanation
The structure of cross linked polymer, Bakelite is shown above. It is formed by condensation polymerization of Phenol and formaldehyde monomers.
Option A is correct.
Which polymer is used in the preparation of hose-pipe?
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0%
Orlon
0%
Polystyrene
0%
Teflon
0%
Altame
Explanation
Teflon is used to prepare hose-pipe. Teflon inner layer excels in corrosion resistance and ensures flexibility.
Option C is correct.
A polymer used in paints is:
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nomex
0%
thiokol
0%
saran
0%
glyptal
Explanation
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.
Hence, option D is correct.
Rubber is very soft. Therefore, it is vulcanized and used in tires. Vulcanised rubber resists:
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drops of acid rain
0%
cold temperatures
0%
jerking movement
0%
wear and tear due to friction
Explanation
Vulcanization is the process by which rubber molecules are cross linked with each other by heating the liquid rubber with sulphur. Crosslinking increases the strength and elasticity of rubber. It is very elastic such that it can be stretched reversible.
Which of the following polymer is used in pigment?
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Buna- S
0%
Neoprene
0%
Teflon
0%
Orlon
Explanation
Buna-S is used to bind pigmented coatings. It is the polymer derived from styrene and buta-diene.
Consider the following repeat unit structure:
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Poly(amide-imide)
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Polyacrylonitrile
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Polybutadiene
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Polyethylene
Natural fibre is :-
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0%
Bakelite
0%
Cellulose
0%
Rubber
0%
Nylon-$$6$$
Which of the following cannot be grouped as polyolefins?
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Polethene
0%
Polypropene
0%
Nylon-6
0%
none
Which one of the following polymer is step-growth polymer?
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0%
Polyethylene
0%
Nylon-$$6,6$$
0%
Buna-$$S$$ rubber
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Orlon
Which of the following is not addition copolymer?
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0%
Saran
0%
BUNA -N
0%
SBR
0%
PVC
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