Polymers Test

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Polymers Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Rubber is heated with sulphur and the process is known as:

A
Galvanization

B
Vulcanization

C
Bessemerization

D
Sulphonation

Solution

Natural Rubber is heated in the presence of sulphur. This produces cross-linking and leads to a harder material that is markedly more resistant to heat and relatively more elastic. This process is called vulcanization.
Question 2
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When 280 gm of ethylene polymerises to polyethene according to the equation.

$$nCH_2=CH_2 \longrightarrow -(CH_2-CH_2)_n-$$

The weight and mole of polyethylene formed will be:

A
280, 10n

B
$$\displaystyle \frac{280}{n}$$, n

C
$$\displaystyle \frac{280}{n}$$, 280

D
280, $$\displaystyle \frac{10}{n}$$

Solution

During polymerization of ethylene to polyethylene, no atoms are lost or added to ethylene. Thus, total mass of ethylene is equal to total mass of polyethylene. 280 gm of ethylene polymerises to give 280 gm of polyethylene.

The molar mass of ethylene is 28 g/mol. 280 gm of ethylene $$= \dfrac {280 g}{28 g/mol} = 10$$ mol.

$$nCH_2=CH_2 \xrightarrow { \text { polymerization }} (-CH_2-CH_2-)_n$$
n moles of ethylene will give 1 mole and $$n\times 28$$ gm of polyethylene

10 moles of ethylene will give $$\dfrac{10}{n}$$ moles and $$n\times 28 = 10 \times 28 = 280$$ gm of polyethylene.

Option D is correct.
Question 3
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Which among the following is not a natural polymer?

A
Wool

B
Silk

C
Rubber

D
PVC

Solution

There are two types of polymers: synthetic and natural.

Synthetic polymers are derived from petroleum oil and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethene, polyester, Teflon, and epoxy.

$$\text {Polyvinyl chloride}$$, commonly abbreviated PVC, is the third-most widely produced synthetic plastic polymer.

Natural polymers occur in nature and can be extracted. Examples of naturally occurring polymers are silk, wool, DNA, cellulose and proteins and rubber.

Option D is correct
Question 4
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Which of the following are polyesters?
Cotton, Terylene, Nylon, PET, Rayon, Acrylic.

A
Cotton, Nylon, Rayon

B
Acrylic, PET, Cotton

C
Terylene, PET, Acrylic

D
PET, Nylon, Rayon

Solution

Terylene, PET and Acrylic are polyesters.
cotton is natural fibres and nylon is the synthetic polymer.
Rayon is a natural-based material that is made from the cellulose obtained from wood pulp or cotton.
Question 5
1 / -0

PP (Polypropylene) is used for making _____________.

A
disposable cups

B
liquid detergents

C
grocery bags

D
electric switches

Solution

PP (Polypropylene) is used for making disposable cups.
Question 6
1 / -0

Pick out the incorrect statement amongst the following.

A
Nylon clothing can stand high temperature and are therefore good to wear in summers

B
Thermosetting plastics do not become soft on heating

C
Addition polymers are formed without the elimination of by-product molecules

D
Natural rubber is obtained as latex from rubber trees

Solution

Nylon is very much suitable for hosiery and the knitted fabrics because of its smoothness, light weight and high strength. Nylon is a lustrous fibre.
Thermoset materials are generally stronger than thermoplastic materials due to this three-dimensional network of bonds (cross-linking), and are also better suited to high-temperature applications up to the decomposition temperature.
Natural rubber is obtained as latex from rubber trees.
An addition polymer is a polymer which is formed by an addition reaction, where many monomers bond together via rearrangement of bonds without the loss of any atom or molecule.
Question 7
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Natural rubber is heated with an element X to make it hard, strong and more elastic. X is:

A
zinc

B
sulphur

C
lead

D
$$H_2$$

Solution

Natural Rubber is heated in the presence of sulphur. This produces cross-linking and leads to a harder material that is markedly more resistant to heat and relatively more elastic. This process is called vulcanization.

Option B is correct.
Question 8
1 / -0

Rubber is hardened for making tyres by:

A
adding $$H_2$$

B
adding carbon black

C
saturating it

D
All of the above

Solution

Carbon black is used in various formulations with different rubber types to customize the performance properties of tyres. Different grades of carbon black are used to optimize properties like handling,tradewear, fuel mileage and abrasion resistance.
Question 9
1 / -0

The monomer of Buna-S are:

A
styrene and butadiene

B
isoprene and butadiene

C
vinyl chloride and Sulphur

D
butadiene.

Solution

Styrene and 1,3-Butadiene.
Styrene-butadiene or styrene-butadiene rubber (SBR) describe families of synthetic rubbers derived from styrene and butadiene (the version developed by Goodyear is called Neolite). These materials have good abrasion resistance and good ageing stability when protected by additives. About 50% of car tires are made from various types of SBR. The styrene/butadiene ratio influences the properties of the polymer: with high styrene content, the rubbers are harder and less rubbery.
Question 10
1 / -0

When formaldehyde is heated with phenol in the presence of an alkali, the product formed is:

A
rubber

B
bakelite

C
chloroprene

D
neoprene

Solution

Bakelite forms in a condensation reaction of phenol and formaldehyde, with wood flour or asbestos fiber as a filler, under high pressure and heat in a time frame of a few minutes of curing. The result is a hard plastic material.
Molecular Formula :$$({ C }_{ 6 }{ H }_{ 6 }O.C{ H }_{ 2 }O)_{ n }$$
Making Bakelite was a multi-stage process. It began with the heating of phenol and formaldehyde in the presence of a catalyst such as hydrochloric acid, zinc chloride, or the base ammonia

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Polymers Test - 29

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Polymers Test - 29

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SHARING IS CARING

Question 1

Galvanization

Vulcanization

Bessemerization

Sulphonation

Solution

Question 2

280, 10n

$$\displaystyle \frac{280}{n}$$, n

$$\displaystyle \frac{280}{n}$$, 280

280, $$\displaystyle \frac{10}{n}$$

Solution

Question 3

Wool

Silk

Rubber

PVC

Solution

Question 4

Cotton, Nylon, Rayon

Acrylic, PET, Cotton

Terylene, PET, Acrylic

PET, Nylon, Rayon

Solution

Question 5

disposable cups

liquid detergents

grocery bags

electric switches

Solution

Question 6

Nylon clothing can stand high temperature and are therefore good to wear in summers

Thermosetting plastics do not become soft on heating

Addition polymers are formed without the elimination of by-product molecules

Natural rubber is obtained as latex from rubber trees

Solution

Question 7

zinc

sulphur

lead

$$H_2$$

Solution

Question 8

adding $$H_2$$

adding carbon black

saturating it

All of the above

Solution

Question 9

styrene and butadiene

isoprene and butadiene

vinyl chloride and Sulphur

butadiene.

Solution

Question 10

rubber

bakelite

chloroprene

neoprene

Solution

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