Polymers Test

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Polymers Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

The empirical formula of natural rubber is:

A
$$(C_{3}H_{5})_{n}$$

B
$$(C_{5}H_{8})_{n}$$

C
$$(C_{5}H_{3})_{n}$$

D
$$(C_{8}H_{5})_{n}$$

Solution

Natural rubber is formed from the polymerization of monomer, isoprene. The structure of isoprene is as follows :
$$CH_{3}$$
$$\mid$$
$$H_{2}C=C-CH=CH_{2}$$
The repeating unit of rubber as shown in the figure contains $$5$$ atoms of carbon and $$8$$ atoms of hydrogen. Hence, its empirical formula becomes $$(C_{5}H_{8})_n$$.
Question 2
1 / -0

The tensile strength, elasticity and resistance to abrasion can be increased by a process called:

A
Galvanisation

B
Vulcanization

C
Bessemerisation

D
Sulphonation

Solution

In vulcanization, there is formation of crosslinks of sulphur at the reactive sites of the double bond which stiffens the rubber and also increase the resistance to abrasion and tensile strength, the elasticity of the rubber.
Question 3
1 / -0

Which of the following is an example of condensation polymers?

A
Polythene

B
Orlon

C
Terylene

D
None of these

Solution

Condensation polymerization: This type of polymerization generally involves a repetitive condensation reactions between two bi-functional monomers. These poly-condensation reactions may result in the loss of simple molecule as water, alcohol etc.
Example: Terylene (as shown in the figure).
Question 4
1 / -0

The number average molecular mass and mass average molecular mass of a polymer are $$30,000$$ and $$40,000$$ respectively. The PDI of the polymer is

A
$$< 1$$

B
$$>1$$

C
$$1$$

D
$$0$$

Solution

PDI (Polydispersity Index) is the ratio of the mass average molecular mass to the number average molecular mass.

Therefore, $$\text{PDI} = \dfrac{40000}{30000} = 1.33$$.

Thus, PDI of the polymer is $$>1$$.
Question 5
1 / -0

Terylene is:

A
an addition polymer with a benzene ring in every repeating unit.

B
a condensation polymer with a benzene ring in every repeating unit.

C
an addition polymer with two carbon atoms in every repeating unit.

D
a condensation polymer with two nitrogen atmos in every repeating unit.

Solution

Terylene is a condensation polymer. It is formed by condensation of ethylene glycol and terephthalic acid.
Terylene polymer contains benzene ring in every repeating unit.
Question 6
1 / -0

The formula for calculating $$\bar{M_{n}}$$ of a polymer is:

A
$$\frac{\sum NiMi}{\sum Ni}$$

B
$$\frac{\sum NiMi}{\sum Mi}$$

C
$$\frac{\sum NiMi^{2}}{\sum Mi}$$

D
$$\frac{\sum NiMi^{2}}{\sum NiMi}$$

Solution

$$\bar{M_{n}}$$ is the number average molecular mass of a polymer which is calculated as the ratio of the total mass of all the molecules of a sample polymer divided by the total number of molecules.

Hence, $$\bar{M_{n}}=\cfrac{\sum NiMi}{\sum Ni}$$.
Question 7
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Dacron is an example of a/an:

A
elastomer

B
fibre

C
thermoplastic

D
thermosetting polymer

Solution

Fibres are thread forming solids which possess high tensile strength.

$$\text{Dacron}$$ is formed by the interaction of ethylene glycol and terephthalic acid.
Question 8
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Which of the following is an elastomer?

A
Vulcanized rubber

B
Dacron

C
Polystyrene

D
Melamine

Solution

An elastomer is a polymer with viscoelasticity (colloquially "elasticity"), generally having low Young's modulus and high failure strain compared with other materials.

Vulcanized rubber is a natural elastomer that has been made more durable by a biochemical process that cures the rubber.

Vulcanized rubber is an elastomer.

Option A is correct.
Question 9
1 / -0

$$\bar{M_{n}}$$ and $$\bar{M_{w}}$$ of a synthetic polymer are related as

A
$$\bar{M_{n}}< \bar{M_{w}}$$

B
$$\bar{M_{n}}> \bar{M_{w}}$$

C
$$\bar{M_{n}}= \bar{M_{w}}$$

D
$$\bar{M_{n}}= \sqrt{\bar{M_{w}}}$$
Question 10
1 / -0

Which one is resistant to vegetable and mineral oils?

A
Neoprene

B
Glyptal

C
Nitrile rubber

D
Both B and C

Solution

Neoprene has superior resistance to vegetable and mineral oils. The material used in the neoprene is nothing but the rubber which has strong resistant towards vegetable and mineral oil.

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Polymers Test - 17

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Polymers Test - 17

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Question 1

$$(C_{3}H_{5})_{n}$$

$$(C_{5}H_{8})_{n}$$

$$(C_{5}H_{3})_{n}$$

$$(C_{8}H_{5})_{n}$$

Solution

Question 2

Galvanisation

Vulcanization

Bessemerisation

Sulphonation

Solution

Question 3

Polythene

Orlon

Terylene

None of these

Solution

Question 4

$$< 1$$

$$>1$$

$$1$$

$$0$$

Solution

Question 5

an addition polymer with a benzene ring in every repeating unit.

a condensation polymer with a benzene ring in every repeating unit.

an addition polymer with two carbon atoms in every repeating unit.

a condensation polymer with two nitrogen atmos in every repeating unit.

Solution

Question 6

$$\frac{\sum NiMi}{\sum Ni}$$

$$\frac{\sum NiMi}{\sum Mi}$$

$$\frac{\sum NiMi^{2}}{\sum Mi}$$

$$\frac{\sum NiMi^{2}}{\sum NiMi}$$

Solution

Question 7

elastomer

fibre

thermoplastic

thermosetting polymer

Solution

Question 8

Vulcanized rubber

Dacron

Polystyrene

Melamine

Solution

Question 9

$$\bar{M_{n}}< \bar{M_{w}}$$

$$\bar{M_{n}}> \bar{M_{w}}$$

$$\bar{M_{n}}= \bar{M_{w}}$$

$$\bar{M_{n}}= \sqrt{\bar{M_{w}}}$$

Question 10

Neoprene

Glyptal

Nitrile rubber

Both B and C

Solution

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