Polymers Test

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Polymers Test - 69

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Weekly Quiz Competition

Question 1
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Polymers of the type $$Z – M_n – Y$$, i.e. those which contain a foreign molecule in addition to the recurring unit are known as:

A
Semisynthetic polymers

B
Atactic polymers

C
Telomers

D
Plasticiser

Solution

Polymers of the type $$Z-M_n-Y$$, those which contain a foreign molecule in addition to the recurring unit are known as telomers and the process of their formation is called telomerisation.

Hence, option $$C$$ is correct.
Question 2
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Neoprene is a polymer of:

A
Propene

B
Vinyl chloride

C
Chloroprene

D
Butadiene

Solution

Neoprene (also polychloroprene) is a family of synthetic rubbers that are produced by polymerization of chloroprene.
Hence, option $$C$$ is correct.
Question 3
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The product of addition polymerisation reaction is:

A
PVC

B
Nylon

C
Terylene

D
Polyamide

Solution

In addition polymerization (sometimes called chain-growth polymerization), a chain reaction adds new monomer units to the growing polymer molecule one at a time through double or triple bonds in the monomer.

Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer without forming any by-product.

The monomers for nylon 6-6 are adipic acid and hexamethylenediamine. The two molecules are combined to create the polymer and water (H2O) is produced as a by-product.

Terylene is a synthetic polyester fiber produced by polymerizing ethylene glycol and terephthalic acid which is obtained from petroleum.

A polyamide is a polymer with repeating units linked by amide bonds. Polyamides can be formed by the condensation of molecules that contain both a carboxyl and an amino $$(NH_2\ \ or \ \ NH)$$ group.

Hence, option $$A$$ is correct.
Question 4
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The process of vulcanisation makes rubber:

A
Soluble in water

B
Elastic

C
Hard

D
Soft

Solution

Vulcanization is a chemical process in which the rubber is heated with sulphur at 373K to 415K. The process involves the formation of cross-links between long rubber molecules so as to achieve improved elasticity, resilience, tensile strength, viscosity, hardness and weather resistance.
Hence, option $$C$$ is correct.
Question 5
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In elastomer, intermolecular forces are:

A
Nil

B
Weak

C
Strong

D
Very strong

Solution

Rubber-like solids with elastic properties are called elastomers.
Polymer chains are held together in these materials by relatively weak inter-molecular bonds i.e. weak Van-der Waals interaction, which permit the polymers to stretch in response to macroscopic stresses.

Hence, option $$B$$ is correct.
Question 6
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Which of the following is a polyamide?

A
Teflon

B
Nylon 66

C
Terylene

D
Bakelite

Solution

Polyamides are prepared by condensation polymerization of diamines with dicarboxylic acid or condensation of amino acids or their lactams.

Teflon is a polymer, which is made by joining together lots of smaller molecules called tetrafluoroethene (TFE).

Nylon-6,6 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine, and adipic acid (a dicarboxylic acid).

Ethylene glycol and terephthalic acid are monomers which on polymerization gives terylene.

Bakelite is a polymer made up of the monomers phenol and formaldehyde.

Hence, option $$B$$ is correct.
Question 7
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Which of the following has cross-links?

A
Vulcanised rubber

B
Nylon

C
Phenol-formaldehyde resins

D
Both (a) and (c)

Solution

Novolac (low molecular weight polymers derived from phenols and formaldehyde) on heating with formaldehyde undergoes crosslinking to form an infusible solid mass called bakelite (Phenol-formaldehyde resin).

On vulcanisation, sulphur forms cross-links at the reactive sites of double bonds and thus the rubber gets stiffened.

Hence, option $$D$$ is correct.
Question 8
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Isoprene is a valuable substance for making:

A
Propene

B
Liquid fuel

C
Synthetic rubber

D
Petrol

Solution

Rubber is a polymer of isoprene. Its chemical formula is $$(C_5H_8)_n$$.So, we can use it to synthesize rubber.
Hence, option $$C$$ is correct.
Question 9
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Compound(B) is:

A
$$Br(CH_2)_6NH_2$$

B
$$NC(CH_2)_4CN$$

C
$$NC(CH_2)_4CHO$$

D
$$OHC(CH_2)_6CHO$$

Solution
Question 10
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Which of the following is fully fluorinated polymer?

A
Neoprene

B
Teflon

C
Thiokol

D
PVC

Solution

A fluoropolymer is a fluorocarbon-based polymer with multiple carbon-fluorine bonds.
Neoprene (also polychloroprene) have Carbon-chlorine bonds.

Teflon is formed from monomer is tetrafluoroethene (TFE). It has $$C-F$$ bonds.

The monomer of thiokol rubber is ethylene polysulphide having $$C-S$$ bonds.

The monomer unit of PVC is vinyl chloride with $$C-Cl$$ linkage.

Hence, option $$B$$ is correct.