Polymers Test

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Polymers Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

The polymer that can be classified as polyester polymer is:

A
Bakelite

B
Melamine

C
Nylon-6, 6

D
Terylene
Question 2
1 / -0

All terpenes have carbon skeletons made up of____________.

A
isoprene units

B
vinyl units

C
alkenes

D
ethylenes units

Solution

Nearly all terpenes found in the essential oils of many plants have carbon skeleton made up of isoprene units joined in a regular, head-to-tail way. In fact, recognition of the so called isoprene rule has been of great help in working out of structures of terpenes.
Question 3
1 / -0

The method preferred for determining the molecular weight of a polymer is___________.

A
osmotic pressure

B
gas density

C
lowering of freezing point

D
direct weighing of a single molecule

Solution

Osmotic pressure method is the best method for the determination of molecular weight of polymers and proteins, since osmotic pressure, though very small, is measurable.
On the other hand, in other colligative properties ($$\Delta T_b, \Delta T_f, \Delta p/p^o$$), the difference is very small and cannot be measured.
Morever, in osmotic pressure method, heating is not required. While in other methods, heating is required which changes the properties of polymers and proteins.
Hence, the correct option is A.
Question 4
1 / -0

Which material is used for vulcanisation of rubber?

A
Iron

B
Sulphur

C
Chlorine

D
Calcium Carbonate

Solution

The material used for the vulcanisation of rubber is sulphur.

The reasons why the rubber is vulcanised are as follows:

i) It is soft and sticky and becomes more so at high temperature and brittle at low temperature. That is why, it is used at low-temperature range ($$280-330$$) K, where its elasticity is maintained.
ii) It is attacked by oxygen and other oxidising agents.
iii) It has a high water absorption capacity, low tensile strength and low resistance to abrasion.
iv) It is reactive to organic solvents.
Therefore, natural rubber is vulcanised by heating it with about ($$3-5\%$$) sulphur at ($$373-415$$) K.
Question 5
1 / -0

The chemical name of melamine is_________.

A
$$2,4$$-Diamino-1$$,3,5$$-triazine

B
$$2$$-Amino-$$1,3,5$$-triazine

C
$$2,4,6$$-Triamino-$$1,3,5$$-triazine

D
$$1,3,5$$-Triamino-$$2,4,6$$-triazine

Solution

The chemical name of melamine is 2,4,6-Triamino-1,3,5-triazine
It is aromatic monomer present in melamac.
Question 6
1 / -0

Which of the following is not a condensation polymer ?

A
Nylon - $$6,\: 6$$

B
PTFE

C
Dacron

D
Glyptal

Solution

Condensation polymers are any kind of polymers formed through a condensation reaction where molecules join together losing small molecules as by-products such as water or methanol, e.g., Nylon-$$6,\:6$$, Dacron (or Terylene) and Glyptal etc.
This is opposed to addition polymers, which involve the reaction of unsaturated monomers, e.g. PTFE.
Question 7
1 / -0

Which one is not a step polymer ?

A
Nylon-6, 6

B
Nylon-6

C
Glyptal

D
PMMA

Solution

Step-growth polymerization refers to a type of polymerization mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers, longer oligomers and eventually long-chain polymers.

For example, Nylon polymerizes by step-growth polymerization process, in which difunctional monomers containing equal parts of amine and carboxylic acid react so that amides are formed at both ends of each monomer.

Particularly, Nylon-6,6 is formed by adipic acid and hexamethylenediamine and Nylon-6 is formed by Caprolactum. Glyptal - a polyester, is formed by ethylene glycol and phthalic acid.

Whereas, PMMA (poly(methyl methacrylate) is formed by the chain-growth polymerization of methyl methacrylate. Chain-growth polymerization (or addition polymerization) involves the linking together of molecules incorporating double or triple carbon-carbon bonds.

Hence, the correct option is D.
Question 8
1 / -0

Cellulose is a condensation polymer of:

A
Maltose

B
$$\beta - Glucose$$

C
$$\alpha - Glucose$$

D
$$\beta -Fructose$$

Solution

Given image explains polymerization reaction of Cellulose.
Question 9
1 / -0

The basic unit of neoprene is_______________.

A
chloroprene

B
isoprene

C
styrene

D
butadiene

Solution

The basic unit of neoprene is chloroprene, which forms neoprene by the process of polymerisation as shown in the above reaction.
Question 10
1 / -0

Nylon-6 is prepared from ?

A
Adipic acid and hexamethylene diamine

B
Caprolactum

C
Urea and formaldehyde

D
None of these

Solution

Nylon-6 is prepared from the polymerization of Caprolactum as shown in the above reaction.