Polymers Test

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Polymers Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

According to the equation,

$$nCH_2=CH_2\rightarrow (-CH_2-CH_2-)_n$$.

When $$100$$g of ethylene polymerises to polyethylene, then the weight of polyethylene produced will be:

A
$$\displaystyle\frac{n}{2}$$ g

B
$$100$$ g

C
$$\displaystyle\frac{100}{n}$$ g

D
$$100n$$ g

Solution

According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Here all the ethylene molecules are converted into polyethylene.
Hence, 100 g of ethylene will form 100 gm of polyethylene.

Hence, option B is correct,
Question 2
1 / -0

Which one of the following is the structure of polyacrylonitrile ?

A
$$\left(\!\!\!\!\!-CH_2-\underset{Cl}{\underset{|}{C}}H-\!\!\!\!\!\right)_n$$

B
$$\left(\!\!\!\!\!-CH_2-\underset{CN}{\underset{|}{C}H}-\!\!\!\!\!\right)_n$$

C
$$\left(\!\!\!\!\!-CH_2-\overset{Cl}{\overset{|}{\underset{Cl}{\underset{|}{C}}}}-\!\!\!\!\!\right)_n$$

D
$$\left(\!\!\!\!\!-CH_2- {\overset{CN} {\underset{COOCH_3}{\underset{|} {\overset{|} {C}}}}}-\!\!\!\!\!\right )_n $$

Solution

$$\underset{Acrylontrile}{_nCH_2 = \underset{CN}{\underset{|}{C}H} }\xrightarrow{Polymerisation}\left(\underset{Polyacrylonitrile}{-CH_2 - \underset{CN}{\underset{|}{C}H}}-\right)_n$$

Polyacrylonitrile (PAN), a synthetic resin prepared by the polymerization of acrylonitrile.

Hence, option B is correct.
Question 3
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Which of the following is monomer of natural rubber?

A
Isoprene

B
Chloroprene

C
Caprolactum

D
Styrene
Solution
Correct Answer: Option A

Explanation:
- Polymers have a very high molecular weight. They are made of a large number of units called monomers.
- Natural rubber is a polymer of isoprene. Natural rubber is an example of an addition polymer as it is formed by repeating a monomer without the elimination of any molecule.
- Synthetic rubber has chloroprene as its monomeric unit and it is also an additional polymer.
- Polystyrene is a polymer that is made up of styrene and it is also an addition polymer.
Nylon-$$6$$ is a synthetic polymer and caprolactam is its monomeric unit.

Final Answer: Isoprene is a monomer of natural rubber.
Question 4
1 / -0

Which of the following polymer is not an addition polymer?

A
Teflon

B
BUNA-N

C
PAN

D
Propylene

Solution

BUNA-N is formed by removal of water molecule so it is condensation polymer.
Question 5
1 / -0

PDI for natural polymers is generally close to:

A
zero

B
$$1$$

C
$$10$$

D
$$100$$

Solution

PDI abbreviates as polydispersity index of polymer.
$$PDI=\displaystyle\frac{\bar{M_w}}{M_n}$$

For natural polymers, $$PDI=1$$
and for synthesis polymers, $$PDI>1$$.

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

Teflon is most commonly used in:

A
making water pipes and electrical cable insulation

B
blankets and clothing

C
non-sticky coating

D
latex paints and adhesives

Solution

Teflon is best known for its use in coating non-stick frying-pans and other cookware, as it is hydrophobic and possesses fairly high heat resistance.
Question 7
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Which of the following is incorrect regarding natural rubber ?

A
It is cis-polyisoprene

B
It is amorphous in nature

C
It has syndiotactic stereochemistry

D
Molecules of rubber have coiled conformation

Solution

Rubber has isotactic stereochemistry, not syndiotactic.

Tacticity refers to the orderliness of succession of configurational repeating units in the main chain of a macromolecule. This is an application of stereochemistry as it concerns the spatial arrangement of substituent groups.

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

The monomers of BUNA-S rubber is:

A
vinyl chloride and sulphur

B
butadiene

C
styrene and butadiene

D
isoprene and butadiene

Solution

Monomers of BUNA-S: $$1,3-$$butadiene and styrene
Question 9
1 / -0

Which compound polymerises to neoprene?

A
$${ CH }_{ 2 }=CHCl$$

B
$${ CH }_{ 2 }=CCl-CH={ CH }_{ 2 }$$

C
$${ Cl }_{ 2 }C=C{ Cl }_{ 2 }$$

D
$${ F }_{ 2 }C={ CF }_{ 2 }$$

Solution

Neoprene is synthetic rubber. It is prepared by polymerisation of chloroprene (2-chlorobuta-1,30diene)
Question 10
1 / -0

Which one of the following is not an example of chain growth polymer?

A
Neoprene

B
Buna-S

C
PMMA

D
Glyptal

Solution

Glyptal is a condensation or step growth polymer of ethylene glycol and phthalic acid.

Neoprene, buna-S and PMMA are chain growth polymers.

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Polymers Test - 36

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Polymers Test - 36

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Question 1

$$\displaystyle\frac{n}{2}$$ g

$$100$$ g

$$\displaystyle\frac{100}{n}$$ g

$$100n$$ g

Solution

Question 2

$$\left(\!\!\!\!\!-CH_2-\underset{Cl}{\underset{|}{C}}H-\!\!\!\!\!\right)_n$$

$$\left(\!\!\!\!\!-CH_2-\underset{CN}{\underset{|}{C}H}-\!\!\!\!\!\right)_n$$

$$\left(\!\!\!\!\!-CH_2-\overset{Cl}{\overset{|}{\underset{Cl}{\underset{|}{C}}}}-\!\!\!\!\!\right)_n$$

$$\left(\!\!\!\!\!-CH_2- {\overset{CN} {\underset{COOCH_3}{\underset{|} {\overset{|} {C}}}}}-\!\!\!\!\!\right )_n $$

Solution

Question 3

Isoprene

Chloroprene

Caprolactum

Styrene

Solution

Question 4

Teflon

BUNA-N

PAN

Propylene

Solution

Question 5

zero

$$1$$

$$10$$

$$100$$

Solution

Question 6

making water pipes and electrical cable insulation

blankets and clothing

non-sticky coating

latex paints and adhesives

Solution

Question 7

It is cis-polyisoprene

It is amorphous in nature

It has syndiotactic stereochemistry

Molecules of rubber have coiled conformation

Solution

Question 8

vinyl chloride and sulphur

butadiene

styrene and butadiene

isoprene and butadiene

Solution

Question 9

$${ CH }_{ 2 }=CHCl$$

$${ CH }_{ 2 }=CCl-CH={ CH }_{ 2 }$$

$${ Cl }_{ 2 }C=C{ Cl }_{ 2 }$$

$${ F }_{ 2 }C={ CF }_{ 2 }$$

Solution

Question 10

Neoprene

Buna-S

PMMA

Glyptal

Solution

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