a linear condensation product of phenol and formaldehyde

a cross linked condensation product of urea and formaldehyde

a cross linked condensation product of phenol and formaldehyde

a linear condensation product of urea and formaldehyde

MCQ Questions for Class 12 Engineering Chemistry Polymers Quiz 7

The polymer obtained from the following reactions is :

Synthetic rubber is:

0%
Polyisoprene
0%
Polychloroprene
0%
Polyethene
0%
Polyesters

Major product of the following reaction is :

Which of the following polymers is used to manufacture clothes for firefighters?

0%
Thiokol
0%
Kevlar
0%
Nomex
0%
Dynel

Which is the correct structural formula for terylene?

The commercial name of polyacrylonitrile is:

0%
dacron
0%
orlan (acrilan)
0%
PVC
0%
bakelite

The substance used to harden the rubber for tyre manufacture is:

0%
wax
0%
1,3-butadiene
0%
calcium carbide
0%
carbon black

Explanation

Answer is option

$D.$

$\text{carbon black}:$ carbon black is a rubber reinforcing additive. As a filler in tires, it also helps to extend the life of tire by conducting heat away from tread and belt area.

Polytetrafluoroethylene is commercially knowns as?

0%
Teflon
0%
Freon
0%
Lewisite
0%
Westron

During the vinyl polymerisation, the chain transfer agent is:

0%
$C{Cl}_{4}$
0%
${C}_{6}{H}_{5}OH$
0%
t-butyl peroxide
0%
diphenylamine

Explanation

In the presence of

$C{Cl}_{4}$ or any other chain transfer agents, the monomer polymerizes to give lower average molecular mass polymers.

Hence, the correct option is A.

Plexiglass, also known as PMMA is a polymenr of:

0%
methyl acrylate
0%
methyl methacrylate
0%
acrylic acid
0%
none of these

Which of the following cannot be oxidised by bromine water?

0%
D-arabinose
0%
D-glyceraldehyde
0%
L-glucose
0%
L-fructose

Which of the following polymerises most easily?

0%
$CH_{3}CH_{2}CaCH$
0%
0%
0%

The monomers of Buna-S polymers are:

0%
vinyl chloride and vinylidene
0%
styrene and butadiene
0%
acrylonitrile and butadiene
0%
isobutylene and isoprene

Which of the following alkene gives four monochloro (structural isomer)products after hydrogenation

0%
$Pent-2-ene$
0%
$2-Methylbut-2-ene$
0%
$3-Methylhex-2-ene$
0%
$2,3-Dimethylbut-2-ene$

Which of the following is condensation polymer?

0%
Polypropylene
0%
PMMA
0%
Glyptal
0%
Teflon

Which of the following fibre are used for formation of air craft canopies?

0%
Nylon
0%
Dacron
0%
Orlon
0%
Terylene

Which of the following is monomer of Nylon-

$6$ ?

Explanation

Nylon-6 is obtained from the polymerization of

$\epsilon$ -Carpolactam.
1054666_1168237_ans_4a08d689f1394668ae8fabca14e5912e.png

Which fiber is cellulose derivative:

0%
Nylon
0%
Rayon
0%
Wool
0%
Polyster

$PMMA$ is a:

0%
Polyamide
0%
Copolymer
0%
Step growth polymer
0%
Addition polymer

Poly-

$\beta$ -hydroxybutyrate - co-

$\beta$ -hydroxy valerate (PHBV) is a copolymer of:

0%
3-hydroxybutanoic acid and 4-hydroxypentanoic acid
0%
2-hydroxybutanoic acid and 3-hydroxypentanoic acid
0%
3-hydroxybutanoic acid and 2-hydroxypentanoic acid
0%
3-hydroxybutanoic acid and 3-hydroxypentanoic acid

Thermosetting polymer, bakelite is formed by the reaction of phenol with:

0%
$CH_3CH_2CHO$
0%
$CH_3CHO$
0%
$HCHO$
0%
$HCOOH$

Which of the following is a natural polymer?

0%
Bakelite
0%
Cellulose
0%
PVC
0%
Neoprene

The monomer of the polymer?

0%
0%
${ CH }_{ 3 }-CH=CH-{ CH }_{ 3 }$
0%
${ CH }_{ 3 }-CH={ CH }_{ 2 }$
0%

Monomer of polythene is:

0%
Alcohol
0%
Aldehyde
0%
Acid
0%
Ethylene

What percentage of sulphur is used in the vulcanization of rubber?

0%
$5$ %
0%
$3$ %
0%
$30$ %
0%
$55$ %

Explanation

$5$ % of sulphar is used in order to extent the stiffness of valcanised rubber.

If Mw is the weight average molecular weight and Mn is the number average molecular weight of a polymer, the polydispersity index (PDI) of the polymer is given by:

0%

$\dfrac{\overline{M}_n}{M_w}$
0%

$\dfrac{\overline{M}_w}{\overline{M}_n}$
0%

$\overline{M}_w \times \overline{M}_n$
0%

$\dfrac{1}{\overline{M}_w \times \overline{M}_n}$

In elastomers, the intermolecular forces are _______.

0%
nil
0%
weak
0%
strong
0%
very strong

Caprolactam is the monomeric unit of :

0%
Nylon 6, 6
0%
Nylon 2-Nylon 6
0%
Nylon 6
0%
None of these

Which of the following is a step-growth polymer?

0%
Styrene
0%
Nylon-6,6
0%
Teflon
0%
Rubber

Which among the following is a step growth polymer?

0%
Polyether
0%
PVC
0%
Buna-S
0%
Dacron

The substance used for coagulating rubber from latex is :

0%
Ethanol
0%
Ethanoic acid
0%
Both
0%
None of these

The structure of Nylon-6 is:

Explanation

Solution:- (C)

The structure of Nylon-

$6$ is:

${\left[ -\overset{\underset{||}{O}}{C}-{\left( C{H}_{2} \right)}_{5}-\overset{\underset{|}{H}}{N}- \right]}_{n}$

Which one of the following is a polyamide polymer?

0%
Terylene
0%
Nylon-6
0%
Buna-S
0%
Bakelite

Which one of the following can be used as monomer in polymerisation reaction?

0%
$CH_{3}CH_{2}Cl$
0%
$CH_{3}CH_{2}OH$
0%
$C_{6}H_{6}$
0%
$C_{3}H_{6}$

Explanation

$C_3H_6$ is propylene and is a monomeric unit for polymerisation of polypropylene.

Which of the following is a condensation homopolymer?

0%
Nylon - $6$
0%
Nylon - $6,\:6$
0%
Nylon - $6,\:10$
0%
Dacron

Bubble gum contains ________.

0%
thiokol rubber
0%
styrene - butadiene rubber
0%
isobutylen - isoprene rubber
0%
acrylonitrile - butadiene rubber

Nylon threads are made of ________.

0%
polyethylene polyemer
0%
polyvinyl polymer
0%
polyester polymer
0%
polyamide polymer

Explanation

Nylon threads are polymer of polyamides obtained by condensing amides and /or carboxylic acids
Examples are nylon -

$6$ , nylon -

$6,\: 6$ .

Low density polythene is prepared by:

0%
Free radical polymerizaiton
0%
Cationic polymerization
0%
Anionic polymerization
0%
Ziegler - Natta polymerization

Which of the following is wrong?

0%
PMMA is called plexiglass
0%
PTFE is called teflon
0%
SBR is natural rubber
0%
LDPE is called low density polythene

Which of the following has formaldehyde as one of the starting material?

0%
Melmac
0%
Alkyd resin
0%
PAN
0%
Acrilan

Soft drinks bottles and baby feeding bottles are generally made up of:

0%
polyester
0%
polyurethane
0%
polystyrene
0%
polyamide

Formation of polyethylene from calcium carbide takes place as given below:

$CaC_{2}+2H_{2}O\rightarrow Ca\left ( OH \right )_{2}+C_{2}H_{2}$

$C_{2}H_{2}+H_{2}\rightarrow C_{2}H_{4}$

$nC_{2}H_{4}\rightarrow \left ( -CH_{2}-CH_{2}- \right )_n$
The amount (in kg) of polyethylene obtained from

$64.1$ kg of

$CaC_{2}$ is

0%
$7$
0%
$14$
0%
$21$
0%
$28$

Explanation

Number of moles of

$CaC_2=\dfrac{64.1\times10^3}{64}=1000$ mol

One mole of

$CaC_2$ on hydrolysis and hydrogenation forms one mole of ethene.

$\therefore$ Number of moles of ethene formed

$=1000$ mol

$\therefore$ Mass of polyethene

$=(1000\times{28})$ g

$=28$ kg

The outer capsule of drugs is made up of a polymer of:

0%
glycolic acid and lactic acid
0%
glycine and caproic acid
0%
salicylic acid and p-aminobenzoic acid
0%
$3$ -hydroxybutanoic acid and $3$ -hydroxypentanoic acid

Explanation

The outer capsule of drugs is made up of PHBV (poly

$\beta$ -hydroxy butyrate-co-

$\beta$ -hydroxy valerate) which is used in specially packaging orthopedic devices and in controlled release of drugs.

Which names are associated with PMMA?

0%
Melmac
0%
Acrilan
0%
Saran
0%
Acrylite

Explanation

The name acrylite is associated with PMMA.
PMMA is polymethyl methaacrylate. It is an addition homopolymer of methyl methacrylate (

$\displaystyle CH_2 =C(CH_3)COOCH_3$ ). It is known as plexiglass.

Which of the following is an alternative copolymer?

0%
Styrene
0%
Neoprene
0%
Nylon - $2$ - nylon - $6$
0%
Nylon - $6$

Explanation

Alternative polymers are those polymers which are formed by only two monomeric units which are alternatively arranged in polymeric chain Nylon -

$2$ - nylon -

$6$ .
The formation is shown in the reaction below:

$HOOC-(CH_2)_4-COOH + H_2N-(CH_2)_2-NH_2 \rightarrow -[NH(CH_2)_2NHCO(CH_2)_4CO]_n- + nH_2O$

Novolac is:

0%
a linear condensation product of phenol and formaldehyde
0%
a cross linked condensation product of urea and formaldehyde
0%
a cross linked condensation product of phenol and formaldehyde
0%
a linear condensation product of urea and formaldehyde

The ratio between the number of carbon atoms and nitrogen atoms in melamine molecule is ____.

0%
$1 : 2$
0%
$2: 1$
0%
$2 : 3$
0%
$3 : 2$

Explanation

Number of carbon atom

$= 3$
Number of nitrogen atom

$= 6$

$\therefore$ Ratio

$= 1 : 2$

Which of the following is chloroprene ?

0%
$CH_{2}= CH-CH= CH_{2}$
0%
0%
0%

Natural rubber and gutta-percha respectively, are ___.

0%
cis-polyisoprene and trans-polyisoprene
0%
both are cis-polyisoprene
0%
both are trans-polyisoprene
0%
trans-polychloroprene and cis-polychloroprene

Polymer is:

Explanation

In the given polymerization reaction, first the reactant undergoes

$\beta$ - elimination reaction to form our monomer.

This monomer then undergoes polymerization to form corresponding polymer.

1245338_1611932_ans_e699f3e340d34935b0a4aa4f5d04eeff.jpg

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 7 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 7 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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