Tag: polymers of commercial importance

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Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Which of the following is a monomer of teflon?

  1. Difluoroethane

  2. Trifluoroethane

  3. Tetrafluoroethane

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Teflon is an addition polymer of tetrafluoroethylene.

$\underset {\text{tetrafluoroethylene}}{ n{ F } _{ 2 }C=C{ F } _{ 2 } } \xrightarrow [ \text{Pressure}]{ \text{Heat}} \underset { \text{teflon} }{ -{ ({ F } _{ 2 }C-C{ F } _{ 2 })- } _{ n } } $
It is used to make non-sticky utensils.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Which of the following polymer form net like structure ?

  1. Butyl rubber

  2. Polythene

  3. Polystyrene

  4. Melamine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thermosetting polymers have a net-like structure because of the presence of cross-links between different polymeric chains. Among the given only melanin polymer is a thermosetting polymer, so it has a net-like structure. 


Note: Butyl rubber is a Westerner whereas polythene and polystyrene we thermoplastics.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Which of the following is/are true statement(s) for the preparation of Teflon?

  1. It is produced by condensation polymerization

  2. Water acts as catalyst

  3. The monomer used is tetrafluoroethane

  4. The monomer is obtained from carbon tetrachloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 It is produced by addition polymerization. Water acts as a catalyst. The monomer used is tetrafluoroethylene. It is obtained from chloroform.


The option (B) represents a true statement for the preparation of Teflon.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

STATEMENT-1 : PMMA (Polymethyl methacrylate) is used for making lenses and light covers.
STATEMENT-2 : It has excellent light transmission properties.

  1. STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is a correct explanation for STATEMENT-1

  2. STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1

  3. STATEMENT-1 is True, STATEMENT-2 is False

  4. STATEMENT-1 is False, STATEMENT-2 is True
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PMMA (polymethyl methacrylate) is a widely commercially used bio-degradable polymer. It has excellent light transmission properties, due to which it is used for making lenses and light covers. 

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

List-l                         List-ll                                    
A)Rayon                   1)$CH _{2}O+C _{6}H _{5}OH$


B)Silicone polymers  2) $F _{2}C= CF _{2}$
 
                                             R
                                              |
C) Bakelite              3)  HO-Si-OH
                                              |
                                              R
D) Teflon                     4)Cellulose

  1. A-4 B-3 C-1 D-2

  2. A- 1 B-3 C-2 D-4

  3. A-4 B-2 C-3 D-1

  4. A-2 B-4 C-3 D-1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(A) Rayon:- Cellulose, organic polymer


(B) Silicone polymers consist of Si atom. Thus option 2.

(C) Bakelite:- condensation polymer formed by phenol and formaldehyde network structure


(D) Teflon:- Tetrafluoro ethene get polymerize forming teflon

A-4, B-3, C-1, D-2

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

A: Polymethyl methacrylate is also known as plexi glass.
R: PMMA is used in decorative articles.

  1. Both A and R are correct and R is the correct explanation of the A

  2. Both A and R are correct but R is not the correct explanation of the A

  3. A is correct but R is in correct

  4. A is incorrect but R is correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Polymethyl methacrylate is also known as plexi glass.
PMMA is polymethyl methaacrylate. It is an addition hopolymer of methyl methacrylate ($\displaystyle CH _2 =C(CH _3)COOCH _3 $).
PMMA is used in decorative articles, lenses, sign borads and aircraft windows.