Polymers Test

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Polymers Test - 61

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Weekly Quiz Competition

Question 1
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The polymer formed by condensation of adipic acid and hexamethylene diamine is:

A
Isoprene

B
Rayon

C
Terylene

D
Nylon-$$6, 6$$

Solution

when adipic acid and hexamethylene diamine undergoes condensation, it forms nylon-6,6.
Thus, option-D is correct.
Question 2
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Bakelite is obtained from phenol by reaction with : $$1$$

A
Acetaldehyde

B
Acetal

C
Formaldehyde

D
Chlorobenzene

Solution

Bakelite is obtained from phenol by reaction with formaldehyde.
Bakelite is used in making switches, handles of cooker, frying pans, combs etc.
Question 3
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Which one of the following is not a condensation polymer?

A
Dacron

B
Neoprene

C
Melamine

D
Glyptal

Solution

Neoprene is not a condensation polymer. It is an addition polymer.
Neoprene is made from monomer chloroprene (2-chlorobuta-1,3-diene).

Dacron, Melamine and Glyptal are condensation polymers.

Dacron ( also known as terylene) is a polyester made by condensation polymerisation of ethylene glycol and dimethyl terephthalate.

Glyptal is a copolymer of ethylene glycol and phthalic acid.

Melamine ( or formaldehyde melamine polymer) is obtained from condensation polymerisation of melamine with formaldehyde.
Question 4
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Natural rubber is a polymer of:

A
Neoprene

B
Chloroprene

C
Isoprene

D
Styrene

Solution

Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene).

It is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree.

Hence, option C is correct.
Question 5
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Bakelite is formed by the reaction of:

A
phenol and formaldehyde

B
formaldehyde and aniline

C
adipic acid and ethylene glycol

D
phthalic acid and ethylene glycol

Solution

Bakelite is formed by the reaction of phenol and formaldehyde (methanal). Alkali or acid catalyst is used for the polymerisation. Bakelite is used in making switches, handles of cooker, frying pans, combs etc.
Question 6
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Which of the following is not correctly matched?

A
Neoprene
$$[-CH_2 - \underset{Cl}{\underset{|}{C}} = CH - CH_2 -]_n$$

B

$$[-NH - (CH_2)_6 - NH - CO - (CH_2)_4 - \overset{O}{\overset{||}{C}} - O -]_n$$
Nylon-6,6

C
Terylene

D

$$[\!\!\!\!-CF_2 - CF_2 -\!\!\!\!]_n$$
Teflon

Solution

The correct structure of terylene is given in the image. It is formed by condensation of ethylene glycol and terephthalic acid. So it has an ester group in its repeating unit.
Dacron fiber (terylene) is crease resistant and is used in blending with cotton and wool fibers and also as glass reinforcing materials in safety helmets, etc.
Question 7
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Novolac on heating with formaldehyde undergoes _______ to form an infusible solid mass called _______.

A
polymerization, melamine

B
vulcanization, resin

C
cross-liking, bakelite

D
condensation, polystyrene
Question 8
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In which of the following polymers, ethylene glycol is one of the monomer units?

A

B
$$(\!\!\!\!-CH_2 - CH_2 -\!\!\!\!)_n$$

C

D
$$[\!\!\!- O - \underset{CH_3}{\underset{|\,\,\,\,\,}{CH}} - CH_2 - \underset{O}{\underset{||}{C}} - O - \underset{\,\,\,\,\,CH_2CH_3}{\underset{|\,\,\,\,\,\,}{CH}} - CH_2 - \underset{O}{\underset{||}{C}} -\!\!\!]_n$$

Solution

Ethylene glycol is one of the monomer of Terylene.

Hence, option A is correct.
Question 9
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Match the column I with column II and mark the appropriate choice.
Column I Column II
(A) PVC (i) Rubber
(B) Condensation polymer (ii) Thermoplsatic
(C) Polysaccharide (iii) Dacron
(D) Elastomer (iv) Natural Polymer

A
(A) $$\rightarrow$$ (ii), (B) $$\rightarrow$$ (iii), (C) $$\rightarrow$$ (iv), (D) $$\rightarrow$$ (i)

B
(A) $$\rightarrow$$ (i), (B) $$\rightarrow$$ (ii), (C) $$\rightarrow$$ (iv), (D) $$\rightarrow$$ (iii)

C
(A) $$\rightarrow$$ (iii), (B) $$\rightarrow$$ (iv), (C) $$\rightarrow$$ (i), (D) $$\rightarrow$$ (ii)

D
(A) $$\rightarrow$$ (iv), (B) $$\rightarrow$$ (i), (C) $$\rightarrow$$ (iii), (D) $$\rightarrow$$ (ii)

Solution

PVC (ii)Thermoplastic
Condensation polymer (iii)Dacron
Polysaccharide (iv)Natural polymer
Elastomer (i) Rubber
[A] PVC- It is most commonly used thermoplastic, it is naturally white and very brittle,

[B] Condensation polymerisation- This type of polymerisation generally involves a repetitive condensation reaction between two bi-functional monomers and lead to the formation of high molecular mass condensation polymers.

[C] Polysaccharide-Polysaccharides are polymeric carbohydrate molecules composed of long chains of monosaccharide units bound together by glycosidic linkages,

[D] Elastomer- These are rubber-like solids with elastic properties.

The correct option is [A].
Question 10
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Synthetic rubbers are usually obtained by copolymerisation of:

A
styrene and $$1, 3$$ - butadiene

B
$$1, 4$$ - polyisoprene

C
urea and formaldehyde

D
alkane and $$1, 3 $$ - butadiene

Solution

Synthetic rubbers are formed from petroleum-based monomers. Example - Styrene-butadiene rubber (Buna - S). It is obtained by copolymerisation of styrene and 1,3 - butadiene from a mixture of 3:1 in the ratio.