Polymers Test

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Polymers Test - 58

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is copolymer?

A
Styrene butadiene rubber

B
Polythene

C
Nylon

D
None of the above

Solution

Copolymers or heteropolymers are polymers formed by two or more different types of monomeric units. Styrene rubber or SBR (Styrene butadiene rubber) is prepared by the copolymerization of buta-$$1,3$$-diene ($$70\%$$) and styrene ($$30\%$$).
Polyethene and nylon are formed by only one type of monomeric unit. (ethene and caprolactam)

Option A is correct.
Question 2
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Statement 1: Bakelite is hard and has high melting point.

Statement 2: Intermolecular forces of attraction in it are H-bonding.

A
Statement 1 is true; statement 2 is true; statement 2 is the correct explanation of statement 1

B
Statement 1 is true; statement 2 is true; statement 2 is not the correct explanation of statement 1

C
Statement 1 is true; statement 2 is false

D
Statement 1 is false; statement 2 is true

Solution

Assertion is true. Bakelite is a thermosetting polymer and has a high strength. It has heat-resistant properties in electrical insulators, radio and telephone casings and such diverse products as kitchenware, jewellery, pipe stems, children's toys, and firearms.Hence, have a very high melting point.

Reason is false: A thermoset is a polymer that is irreversibly cured, usually through covalent crosslinking (during or after polymerization). These undergo permanent changes. eg. Bakelite

Hence, answer is C
Question 3
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Silk clothes are prepared from silkworms at which of the following stage of its cycle?

A

B

C

D

Solution

At the pupa stage, the silkworm spins a protective cocoon which serves as protection for the pupa. If the silkworms are allowed to mature and break through the cocoon the silk would be rendered useless for commercial purposes. So the encased insect is plunged into boiling water to kill inhabitant and the cocoon unwound onto a spindle to be made into thread.
Option C is correct.
Question 4
1 / -0

$$\begin{bmatrix}-CH_2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH_2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH_2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-\end{bmatrix}_n$$

Polyvinyl alcohol (as shown above) is a unique polymer having high affinity for water. Which of the following procedures would be most suitable for its preparation?

A
radical chain polymerisation of $$CH_2=CH-CH_2-OH$$

B
radical chain polymerisation of $$CH_2=CH-OH$$

C
radical chain polymerisation of $$CH_2=CH-CO_2CH_3$$, following by base catalysed hydrolysis

D
radical chain polymerisation of $$CH_2=CH-OCOCH_3$$, followed by acid catalysed hydrolysis

E
radical chain polymerisation of $$CH_2=CH-OCOCH_3$$, followed by base catalysed hydrolysis

Solution

$$\begin{bmatrix}-CH_2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH_2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-CH_2-\underset{\underset{\textstyle\;OH}{\displaystyle\mid}}{\;\;\;CH}-\end{bmatrix}_n$$

Polyvinyl alcohol is prepared by radical chain polymerisation of $$CH_2=CH-OCOCH_3$$, followed by base catalysed hydrolysis in which acetate group is replaced by hydroxide group.
Question 5
1 / -0

Which of the following is the biodegradable polymer of polyamide class ?

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

B
Nylon - $$2$$ - nylon - $$6$$

C
Dextran

D
PHBV

Solution

Biodegradable is defined as being able to be broken down by other living organisms. Nylon-$$2$$-nylon-$$6$$, Dextran and PHBV are biodegradable, whereas, Nylon - $$6,\:6$$ is non-biodegradable.

However, Dextran and PHBV, both are polyesters and Nylon-$$2$$-nylon-$$6$$ is a polyamide. Dextran is formed by the polymerization of many glucose molecules.
Question 6
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The formation of polyethylene from calcium carbide takes places as follows :
$$CaC_2 + 2H_2O \rightarrow Ca(OH)_2+C_2H_2$$
$$C_2H_2+H_2\rightarrow C_2H_4$$
$$nC_2H_4\rightarrow (CH_2-CH_2)_n$$
The amount of polyethylene obtained from $$64$$ kg of $$CaC_2$$ is :

A
$$14$$ kg

B
$$7$$ kg

C
$$21$$ kg

D
$$28$$ kg

Solution

Mass of $$Ca{ C }_{ 2 }$$ = $$64$$ Kg

Moles of $$Ca{ C }_{ 2 }$$ = 64/64 = $$1000$$ mol

$$CaC_2 + 2H_2O \rightarrow Ca(OH)_2+C_2H_2$$

For 1000 mole of $$Ca{ C }_{ 2 }$$ , We get 1000 mole of $${ C }_{ 2 }{ H }_{ 2 }$$

$$C_2H_2+H_2\rightarrow C_2H_4$$

For 100 mole of $${ C }_{ 2 }{ H }_{ 2 }$$ , we get 1000 mole of $${ C }_{ 2 }{ H }_{ 4 }$$

$$nC_2H_4\rightarrow (CH_2-CH_2)_n$$

For n mole $${ C }_{ 2 }{ H }_{ 2 }$$ , we get 1 mole of polyethylene.
For 1000 mole of $${ C }_{ 2 }{ H }_{ 2 }$$ , we get $$(\dfrac { 1000 }{ n } )\times 1$$
Number of moles of polyethylene formed are 1000/n.

Molecular weight of polyethylene is $$n\times [(2\times 12)+(2\times 4)]=28n$$

Mass of polyethylene produced $$=$$ Number of moles $$\times$$ Molecular weight
$$=(\dfrac { 1000 }{ n } )\times 28n$$

$$=28000$$ gram

$$=28$$ kg

Option D is correct.
Question 7
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Which of the following is not correctly matched?

A

B

C

D

Solution

The reactions explains the polymerization of each of the give polymers.
In option C given structure of terylene has a missing oxygen atom can be seen in the above reaction. Hence, the option C is the answer.
Question 8
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Statement 1: Polybutadiene is an example of step growth polymer.
Statement 2: Copolymerisation of butadiene and acrylonitrile gives Buna-N.

A
Statement 1 and statement 2 is true and statement 2 is the correct explanation of statement 1

B
Statement 1 and statement 2 is true but statement 2 is not the correct explanation of statement 1

C
Statement 1 is true and statement 2 is false

D
Statement 1 is false and statement 2 is true
Question 9
1 / -0

Which of the following sets contains only co-polymers ?

A
PVC, Neoprene

B
Polythene, Polyester

C
Nylon-6, Teflon

D
Melmac, Bakelite
Question 10
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Statement 1: Teflon has high thermal stability and chemical inertness.

Statement 2: It has strong C-F bonds.

Choose the correct option:

A
Statement 1 is true: Statement 2 is true; statement 2 is the correct explanation of statement 1

B
Statement 1 is true: statement 2 is true; statement 2 is not the correct explanation of statement 1

C
Statement 1 is true; statement 2 is false

D
Statement 1 is false; statement 2 is true