Polymers — Page 4 | NEET Chemistry

Q31

The polymer containing strong intermolecular forces e.g. hydrogen bonding, is

A teflon

B nylon 6,6

C polystyrene

D natural rubber

Correct Answer

Option B

Solution

Nylon

6-6

has amide linkage capable of forming hydrogen bonding.

Q32

Consider the Assertion and Reason given below. Assertion (A) : Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins. Reason (R) : High density polymers are closely packed and are chemically inert. Choose the correct answer from the following:

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

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

C (A) is correct but (R) is wrong.

D (A) and (R) both are wrong.

Correct Answer

Option A

Solution

High density polyethene is hard and chemically inert thats why used to make buckets and dustbins.

Q33

The polymer, which can be stretched and remains its original status on releasing the force is

A Bakelite.

B Nylon 6, 6.

C Buna-N.

D Terylene.

Correct Answer

Option C

Solution

Buna – N is synthetic rubber which can be stretched and retains its original status on releasing the force.

Q34

The correct match between Item - I and Item - II is : .tg .tg Item - I Item - II

List - I		List - II
(a)	Natural rubber	(I)	1, 3-butadiene + styrene
(b)	Neoprene	(II)	1, 3-butadiene + acrylonitrile
(c)	Buna-N	(III)	Chloroprene
(d)	Buna-S	(IV)	Isoprene

A (a) - (IV), (b) - (III), (c) - (II), (d) - (I)

B (a) - (III), (b) - (IV), (c) - (I), (d) - (II)

C (a) - (III), (b) - (IV), (c) - (II), (d) - (I)

D (a) - (IV), (b) - (III), (c) - (I), (d) - (II)

Correct Answer

Option A

Solution

Natural rubber – Polymer of isoprene Neoprene – Polymer of chloroprene Buna N – Polymer of 1,3-Butadiene and acrylonitrile Buna S – Polymer of 1,3-Butadiene and styrene

Q35

Match with : .tg .tg

List - I		List - II
(A)	Nylon 6, 6	(I)	Buckets
(B)	Low density polythene	(II)	Non-stick utensils
(C)	High density polythene	(III)	Bristles of brushes
(D)	Teflon	(IV)	Toys

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

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

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

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

Correct Answer

Option B

Solution

Nylon

6,6 \rightarrow

used in making bristles of brushes Low density polythene $\rightarrow$ used in making Toys High density polythene $\rightarrow$ used in making Buckets Teflon $\rightarrow$ used in making non-stick utensils

Q36

Nylon threads are made of

A polyester polymer

B polyamide polymer

C polyethylene polymer

D polyvinyl polymer

Correct Answer

Option B

Solution

Nylon is a polyamide polymer.

Q37

Match List I with List II .tg .tg List I (Name of polymer) List II (Uses) A. Glyptal I. Flexible pipes B. Neoprene II. Synthetic wool C. Acrilan III. Paints and Lacquers D. LDP IV. Gaskets Choose the correct answer from the options given below :

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

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

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

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

Correct Answer

Option D

Solution

(A) Glyptal - (III) Paints and Lacquers (B) Neoprene - (IV) Gaskets (C) Acrilan - (II) Synthetic wool (D) LDP - (I) Flexible pipes

Q38

The species which can best serve as an initiator for the cationic polymerization is :

A LiAlH4

B HNO3

C AlCl3

D BuLi

Correct Answer

Option C

Solution

Lewis acids are the most common compounds used for initiation of cationic polymerisation.

The more popular Lewis acids are

SnC{l_4},\,\,AlC{l_3},\,\,B{F_3}

and

TiC{l_4}.

Q39

Bakelite is a cross-linked polymer of formaldehyde and :

A PHBV

B Buna-S

C Novolac

D Dacron

Correct Answer

Option C

Solution

Novolac (phenol formaldehyde Resin) $\to$ Bakelite

Q40

Which one of the following polymers is not obtained by condensation polymerisation?

A Bakelite

B Nylon 6

C Buna-N

D Nylon 6, 6

Correct Answer

Option C

Solution

Buna-N : Obtained by addition polymerisation Nylon 6, Bakelite, Nylon 6, 6 : Obtained by condensation polymerisation.