Polymers Test

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Polymers Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

Heating rubber with sulphur is known as:

A
galvanization

B
bessemerisation

C
vulcanization

D
sulphonation
Solution
The formation of vulcanised rubber-
To improve these physical properties,
water repelent
Less water absorption
Resist for oxidising agents
Strength
a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between 373 K to 415 K.On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened, The correct option is [C].
Question 2
1 / -0

In vulcanization of rubber :

A
sulphur reacts to form a new compound

B
sulphur cross-links are introduced

C
sulphur forms a very thin protective layer over rubber

D
all statements are correct
Solution
Vulcanisation of rubber-
To improve these physical properties,
Strength
Resistance for oxidation
Repulsion from water
a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between $$373 K to 415 K.$$ On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.
The correct option is [B].
Question 3
1 / -0

Few polymers are matched with their uses. Point out the wrong match.

A
Polyester - Fabric, tyre cords, safety belts

B
Nylon 6 - Ropes, tyre cords, fabrics

C
Bakelite - Packaging industry, lubricant

D
Teflon - Oil seals, gaskets, non-stick utensils
Solution
Uses of bakelite:
For making combs, phonograph records, electrical switches,
For making handles of various utensils,
Paints
So the incorrect option is [C}.
Question 4
1 / -0

Which one of the following statements is wrong?

A
PVC stands for poly vinyl chloride.

B
PTFE stands for Teflon.

C
PMMA stands for polymethyl methacrylate.

D
Buna-S stands for natural rubber.

Solution

Natural rubber (polyisoprene) is a polymer of cis-isoprene,
Buna-S is also an elastomer but it is the copolymer of Butadiene and styrene,
The statement [D] is wrong.
Question 5
1 / -0

On complete hydrogenation, natural rubber produces:

A
ethylene-propylene copolymer

B
vulcanized rubber

C
polypropylene

D
polybutylene

Solution

Natural rubber forms due to polymerisation of isoprene and on hydrogenation provide a polymer of the ethylene-propylene copolymer.

Hence, option A is correct.
Question 6
1 / -0

Which of the polymer has weakest intermolecular force of attraction?

A
nylon

B
poly(vinyl chloride)

C
cellulose

D
natural rubber

Solution

The order of the strength of the polymer is -
Elastomer < Thermoplastic < Fibers < Thermosetting plastic

Natural rubber is an elastomer. So it would have the weakest intermolecular force of attraction.
Question 7
1 / -0

Match the column I with column II and mark the appropriate choice.
Column I Column II
(A) Raincoats, hand bags (i) PHBV
(B) Laminated sheets (ii) PVC
(C) Television cabinets (iii) Urea-formaldehyde resin
(D) Orthopaedic devices (iv) Polystyrene

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

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

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

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

Solution

Raincoats, handbags (ii) PVC
Laminated sheets (iii) Urea-formaldehyde resin
Television cabinets (iv) Polystyrene
Orthopedic devices (i) PHBV
Uses of polyesters- it is crease resistant and is used in blending with cotton and wool fibers and also as glass reinforcing materials in safety helmets, etc.
So the correct option is [C}.
Question 8
1 / -0

Buna-N is used in making oil seals and tank linings, etc. because:

A
it is resistant to the action of lubricating oil and organic solvents

B
it is more elastic than natural rubber

C
it can be stretched twice its length

D
it does not melt at high temperatures
Solution
Properties of Buna$$-N$$
It is resistant to the action of petrol, lubricating oil and organic solvents,
Uses-
Making oil seals
Tank lining.
The correct option is [A].
Question 9
1 / -0

Which of the following is not true about polymers?

A
Polymers are high molecular mass macro-molecules.

B
Polymers may be of natural or synthetic origin.

C
Condensation polymers are made up of one type of monomers only.

D
They have high viscosity and do not carry any charge.

Solution

A) Polymers are high molecular mass macro-molecules made with a large number of repeating subunits.
B) Naturally occurring polymers - Silk, Wool, DNA, etc.
Synthetic polymers- Nylon, Polyethylene, Polyester etc.
C) Two bi-functional monomers are used in condensation polymerisation,
Example Nylon-6,6 is the polymer of Hexamethylenediamine + adipic acid
So this statement is false.
D) Polymers are large chain molecules so they have high viscosity. Since monomers of polymers are neutral, the overall polymer is also neutral.
Question 10
1 / -0

Which of the following is not a semi-synthetic polymer?

A
Cis-Polyisoprene

B
Cellulose nitrate

C
Cellulose acetate

D
Vulcanized rubber

Solution

Cis-polyisoprene is a polymer of cis-isoprene; it is natural rubber, not a semisynthetic polymer.
So the correct option is [A].

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Re-Attempt Weekly Quiz Competition

	Column I		Column II
(A)	Raincoats, hand bags	(i)	PHBV
(B)	Laminated sheets	(ii)	PVC
(C)	Television cabinets	(iii)	Urea-formaldehyde resin
(D)	Orthopaedic devices	(iv)	Polystyrene

Raincoats, handbags	(ii) PVC
Laminated sheets	(iii) Urea-formaldehyde resin
Television cabinets	(iv) Polystyrene
Orthopedic devices	(i) PHBV

Polymers Test - 43

Result

Polymers Test - 43

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Question 1

galvanization

bessemerisation

vulcanization

sulphonation

Solution

Question 2

sulphur reacts to form a new compound

sulphur cross-links are introduced

sulphur forms a very thin protective layer over rubber

all statements are correct

Solution

Question 3

Polyester - Fabric, tyre cords, safety belts

Nylon 6 - Ropes, tyre cords, fabrics

Bakelite - Packaging industry, lubricant

Teflon - Oil seals, gaskets, non-stick utensils

Solution

Question 4

PVC stands for poly vinyl chloride.

PTFE stands for Teflon.

PMMA stands for polymethyl methacrylate.

Buna-S stands for natural rubber.

Solution

Question 5

ethylene-propylene copolymer

vulcanized rubber

polypropylene

polybutylene

Solution

Question 6

nylon

poly(vinyl chloride)

cellulose

natural rubber

Solution

Question 7

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

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

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

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

Solution

Question 8

it is resistant to the action of lubricating oil and organic solvents

it is more elastic than natural rubber

it can be stretched twice its length

it does not melt at high temperatures

Solution

Question 9

Polymers are high molecular mass macro-molecules.

Polymers may be of natural or synthetic origin.

Condensation polymers are made up of one type of monomers only.

They have high viscosity and do not carry any charge.

Solution

Question 10

Cis-Polyisoprene

Cellulose nitrate

Cellulose acetate

Vulcanized rubber

Solution

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