Polymers(11th And 12th > Chemistry ) Questions and Answers

Question 1.


Assertion: Teflon has high thermal stability and chemical inertness.
Reason: Teflon is a thermoplastic.


  1.     If both assertion and reason are true and the reason is the correct explanation of the assertion.
  2.     If both assertion and reason are true but reason is not the correct explanation of the assertion.
  3.     If the assertion and reason both are false.
  4.     If assertion is false but reason is true.
Explanation:-
Answer: Option B. -> If both assertion and reason are true but reason is not the correct explanation of the assertion.
:
B

Due to the presence of strong C–F bonds teflon has high thermal stability and chemical inertness.
And it is true that it is a thermoplastic. It changes shape on heating and retains the shape. It cannot be reshaped on further heating. 
So, it is true that it is chemically inert but not because it is a thermoplastic. 


Question 2.


Which of the following statements is correct regarding the drawbacks of raw rubber?


  1.     It is not elastic in nature
  2.     It has high durability
  3.     It doesn’t absorb water
  4.     All of these
Explanation:-
Answer: Option A. -> It is not elastic in nature
:
A

The raw rubber is not elastic when found in nature. It becomes soft at high temperature. It has little durability and it has large water absorption capacity.


Question 3.


Which of the following possess the relative strength of intermolecular forces of attraction between that of elastomers and fibres?


  1.     Terylene
  2.     Polythene
  3.     Bakelite
  4.     Nylon
Explanation:-
Answer: Option B. -> Polythene
:
B

Thermoplastic polymers possess intermolecular forces of attraction between elastomers and fibres. Polythene is a thermoplastic polymer.


Question 4.


Based on the mode of their formation, polymers can be classified as?


  1.     As addition polymers only
  2.     As condensation polymers only
  3.     As copolymers
  4.     Both as addition and condensation polymers
Explanation:-
Answer: Option D. -> Both as addition and condensation polymers
:
D

Both as addition and condensation polymers.


Question 5.


Which of the following is a linear polymer?


  1.     Nylon
  2.     Bakelite
  3.     Low density polythene   
  4.     Melamine-formaldehyde polymer
Explanation:-
Answer: Option A. -> Nylon
:
A

Nylon is a linear polymer.
Which Of The Following Is A Linear Polymer?


Question 6.


Which of the following is a monomer of Dacron?


  1.     Adipic acid
  2.     Terephthalic acid
  3.     Acetic acid
  4.     Formic acid
Explanation:-
Answer: Option B. -> Terephthalic acid
:
B

Dacron is formed by the interaction of ethylene glycol and terephthalic acid.
Which Of The Following Is A Monomer Of Dacron?


Question 7.


Which of the following is a monomer of natural rubber?


  1.     Neoprene
  2.     Isoprene
  3.     Chloroprene
  4.     Buna-N
Explanation:-
Answer: Option B. -> Isoprene
:
B

Isoprene is the monomer of natural rubber.
Which Of The Following Is A Monomer Of Natural Rubber?


Question 8.


Which one among the following is a thermosetting plastic?


  1.     PVC
  2.     PVA
  3.     Bakelite
  4.     Perspex
Explanation:-
Answer: Option C. -> Bakelite
:
C

Bakelite is thermosetting polymer. It becomes infusible on heating and cannot be remoulded.


Question 9.


The monomeric units of terylene are glycol and which of the following?


  1.    
  2.    
  3.    
  4.    
Explanation:-
Answer: Option D. ->
:
D

The Monomeric Units Of Terylene Are Glycol And Which Of The ...


Question 10.


Which of the following is not produced by condensation polymerisation?


  1.     Buna-S
  2.     Dacron
  3.     Novolac
  4.     Nylon 6
Explanation:-
Answer: Option A. -> Buna-S
:
A

Buna-S is produced by the addition polymerisation of 1,3-butadiene and Styrene.


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