Polymers

NEET Chemistry · 72 questions · Page 6 of 8 · Click an option or "Show Solution" to reveal answer

Q51

Which of the following statements about low density polythene is FALSE ?

A Its synthesis requires high pressure.

B It is a poor conductor of electricity.

C Its synthesis requires dioxygen or a peroxide initiator as a catalyst.

D It is used in the manufacture of buckets, dust-bins etc.

Correct Answer

Option D

Solution

High density polythene is used in the manufacture of housewares like buckets, dustbins, bottles, pipes etc.

Low density polythene is used for insulating electric wires and in the manufacture of flexible pipes, toys. coats, bottles etc.

Q52

Which polymer is used in the manufacture of paints and lacquers?

A Glyptal

B Polypropene

C Poly vinyl chloride

D Bakelite

Correct Answer

Option A

Solution

Glyptal is used in the manufacture of paints and lacquers.

Q53

Match List I with List II .tg .tg LIST I (Examples) LIST II (Type) A. 2-chloro-1,3- butadiene I. Biodegradable polymer B. Nylon 2-nylon 6 II. Synthetic Rubber C. Polyacrylonitrile III. Polyester D. Dacron IV. Addition Polymer Choose the correct answer from the options given below:

A A-II, B-IV, C-I, D-III

B A-IV, B-I, C-III, D-II

C A-II, B-I, C-IV, D-III

D A-IV, B-III, C-I, D-II

Correct Answer

Option C

Solution

Let's look at each example in List I and try to identify its type: A. 2-chloro-1,3-butadiene: This is an example of a synthetic rubber, which is a type of polymer.

Nylon 2-nylon 6: This is a type of nylon polymer, which is a type of polyester.

Polyacrylonitrile: This is an example of a biodegradable polymer, which can be broken down by microorganisms.

Dacron: This is an example of an addition polymer, which is a polymer formed by the addition of monomers.

Now, let's look at the types in List II and match them with their corresponding examples: I.

Biodegradable polymer: This matches with example C, which is Polyacrylonitrile.

II.

Synthetic Rubber: This matches with example A, which is 2-chloro-1,3-butadiene.

III.

Polyester: This matches with example B, which is Nylon 2-nylon 6.

IV.

Addition polymer: This matches with example D, which is Dacron.

Therefore, the correct matching of List I with List II is: A - II (Synthetic rubber) B - III (Polyester) C - I (Biodegradable polymer) D - IV (Addition polymer) Hence, the correct answer is A-II, B-I, C-IV, D-III.

Q54

Bakelite is obtained from phenol by reacting with

A (CH2OH)2

B CH3CHO

C CH3COCH3

D HCHO

Correct Answer

Option D

Solution

Bakelite is formed by the reaction of formaldehyde

(HCHO)

and phenol so the correct answer is

(d).

Q55

Preparation of Bakelite proceeds via reactions.

A Electrophilic substitution and dehydration

B Condensation and elimination

C Nucleophilic addition and dehydration

D Electrophilic addition and dehydration

Correct Answer

Option A

Solution

Formation of Bakelite follows electrophillic substitution of phenol and formaldehyde followed by dehydration.

Q56

Which of the following is a condensation polymer?

A Neoprene

B Buna-S

C Nylon 6, 6

D Teflon

Correct Answer

Option C

Solution

Nylon 6, 6 is obtained by condensation polymerisation of hexamethylenediamine and adipic acid.

Q57

Assertion : Rayon is a semisynthetic polymer whose properties are better than natural cotton. Reason : Mechanical and aesthetic properties of cellulose can be improved by acetylation.

A Both assertion and reason are correct, and the reason is the correct explanation for the assertion.

B Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.

C Assertion is incorrect statement, but the reason is correct.

D Both assertion and reason are incorrect.

Correct Answer

Option B

Solution

The strength of cellulose is improved by acetylation to form rayon, a semisynthetic polymer which is better than natural cotton.

Q58

Match with : .tg .tg - (Monomer) - (Polymer)

List - I		List - II
(A)	Tetrafluoroethene	(I)	Orlon
(B)	Acrylonitrile	(II)	Natural rubber
(C)	Caprolactam	(III)	Teflon
(D)	Isoprene	(IV)	Nylon-6

A (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

B (A)-(II), (B)-(III), (C)-(IV), (D)-(I)

C (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

D (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

Correct Answer

Option A

Solution

The correct match between List I (Monomer) and List II (Polymer) is as follows: (A) Tetrafluoroethene → (III) Teflon (B) Acrylonitrile → (I) Orlon (C) Caprolactam → (IV) Nylon-6 (D) Isoprene → (II) Natural rubber So, the correct answer is: A-III, B-I, C-IV, D-II

Q59

Which of the following is a thermosetting polymer?

A Buna-N

B PVC

C NyIon6

D Bakelite

Correct Answer

Option D

Solution

Bakelite is an example of thermosetting polymer.

When thermosetting polymer once heated they change their shape which cannot be brought back to their initial shape.

Q60

Given below are two statements, one is Assertion (A) and other is Reason (R). Assertion (A) : Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties. Reason (R) : The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with coiled structure. In the light of the above statements, choose the correct one from the options given below :

A Both (A) and (R) are true and (R) is the correct explanation of (A).

B Both (A) and (R) are true but (R) is not the correct explanation of (A).

C (A) is true but (R) is false.

D (A) is false but (R) is true.

Correct Answer

Option C

Solution

Natural rubber is linear polymer of isoprene (2- methyl-1,3-butadiene) and is also called cis-1,4- polyisoprene.

The cis-polyisoprene molecules consists of various chains held together by weak Vander Waal‟s interactions and has a coiled structure.

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