Polymers Test

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Polymers Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

Which polymer is matched with incorrect use?

A
High density polythene $$-$$ Buckets, pipes

B
Nylon 6,6 $$-$$ Ropes, bristles for brushes

C
Orlon $$-$$ Synthetic wool, carpets

D
Glyptal $$-$$ Electrical switches, combs

Solution

Glyptal is used for paints and in moulds for casting.
So the answer is [D].
Question 2
1 / -0

Which of the following polymer is biodegradable?

A
$$-\!\!\!(CH_2-\underset{Cl}{\underset{|}{C}}=CH-CH_2)\!\!\!-_n$$

B
$$-\!\!\!(CH_2-CH=CH-CH_2-CH_2-\overset{CN}{\overset{|}{CH}})\!\!\!-_n$$

C
$$-\!\!\!(O-\underset{CH_3}{\underset{|}{CH}}-CH_2-\underset{O}{\underset{||}{C}}-O-\underset{CH_2CH_3}{\underset{|}{CH}}-CH_2-\underset{O}{\underset{||}{C}})\!\!\!-_n$$

D
$$-\!\!\!(\overset{H}{\overset{|}{N}}-(CH_2)_6-\overset{H}{\overset{|}{N}}-\overset{O}{\overset{||}{C}}-(CH_2)_4-\overset{O}{\overset{||}{C}})\!\!\!-_n$$

Solution

In view of the general awareness and concern for the problems created by the polymeric solid wastes, certain new biodegradable synthetic polymers have been designed and developed. These polymers contain functional groups similar to the functional groups present in biopolymers.
Example- PHBV.
The correct option is [C].
$$\underset{3-Hydroxybutanoic\, acid}{CH_3-\overset{OH}{\overset{|}{CH}}-CH_2-COOH}\,+\, \underset{3-Hydroxypentanoic\, acid}{CH_3-CH_2\overset{OH}{\overset{|}{CH}}-CH_2-COOH} \rightarrow\underset{PHBV}{ -\!\!\!(O-\underset{CH_3}{\underset{|}{CH}}-CH_2-\underset{O}{\underset{||}{C}}-O-\underset{CH_2CH_3}{\underset{|}{CH}}-CH_2-\underset{O}{\underset{||}{C}})\!\!\!-_n}$$
Question 3
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Which one of the following is an elastomer?

A

B

C

D
Question 4
1 / -0

The copolymer formed by addition polymerization of styrene and acrylonitrile in the presence of peroxide is:

A

B

C

D

Solution
Question 5
1 / -0

Buna-N synthetic rubber is a copolymer of

A

B
$${ H }_{ 2 }C=CH-CH={ CH }_{ 2 }$$ and $$NC-CH={ CH }_{ 2 }$$

C
$${ H }_{ 2 }C=CH-CN$$ and $${ H }_{ 5 }{ C }_{6}-CH-CH={ CH }_{ 2 } $$

D

Solution
Question 6
1 / -0

The most suitable property for molecular weight determination of polymers is:

A
osmotic pressure

B
lowering of vapour pressure

C
elevation in boiling point

D
depression in freezing point

Solution

The osmotic pressure method is quite advantageous over other methods for determination of molecular weight of high molecular masses as pressure measurement is around room temperature and the molarity of solution is used instead of molality.
As compared to other colligative properties, its magnitude is large even for very dilute solutions. The technique of osmotic pressure for determination of molar mass of solutes is particularly useful for biomolecules as they are generally not stable at high temperatures and polymers have poor solubility.
Question 7
1 / -0

Buna-N and Buna-S are the types of

A
Natural rubber

B
Synthetic rubber

C
Buna-N is natural rubber while Buna-S is synthetic rubber

D
None of these
Question 8
1 / -0

This step basically illustrates the:

A
chain initiation

B
chain propagation

C
chain termination

D
All of these

Solution
Question 9
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Which of the following statements is not true?

A
Step growth polymerisation requires a bifunctional monomer.

B
Nylon 6 is an example of step-growth polymerisation

C
Chain growth polymerisation includes both homopolymerisation and copolymerisation.

D
Chain growth polymerisation involves homopolymerisation only.
Question 10
1 / -0

Natural rubber is a polymer of

A
Co-cis-trans isoprene

B
trans-isoprene

C
cis-isoprene

D
none of these

Solution