Tag: polymers of commercial importance

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

List - I                                       List - II
A) Polystyrene                        p) Condensation polymer
B) Polythene                           q) Thermoplastic polymer
C) Nylon- $6, :6$                        r) Polyamide
D) Terylene                             s) Addition polymer

  1. (a - q,s), (b - q,s), (c - p,q,r), (d - p)

  2. (a - p), (b - s), (c - p,r), (d - p,q)

  3. (a - s), (b - q), (c - p,r), (d - q)

  4. (a - q), (b - s), (c - r), (d - p,q)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds, e.g., the formation of polythene from ethene and polypropene from propene. Addition polymers: Polyvinyl chloride, Polythene, Buna-S, Buna-N, etc.

Polystyrene  is a synthetic aromatic polymer made from the monomer styrene.
It is addition polymer as it is made of addition of monomers.

The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. take place. The examples are terylene (dacron), nylon 6, 6, nylon 6, etc. For example, nylon 6, 6 is formed by the condensation of hexamethylene diamine with adipic acid.


Hence, option A is correct.

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

List -I                                List -II
A) Polystyrene               p) $C _{6}H _{5}-CH=CH _{2}$
B) Buna-S                      q) $CH _{2}=CH-CH=CH _{2}$
C) Buna - N                    r) $CH _{2}OH-CH _{2}OH$
D) Terylene                    s) Condensation polymer

  1. a- p

  2. b- p,q

  3. c-r

  4. d-r,s
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation

The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

Terylene is a condensation polymer. Monomers of Terylene is ethylene glycol and teri-phthalic acid.
Buna-S is formed by the monomeric addition of compound styrene (p) and butadiene (q). 
Hence, options A, B and D are correct options.

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

Non-stick frying pans are coated black with Teflon, a material that is resistant to heat. Teflon is a polymer of:

  1. fluoromethane

  2. styrene

  3. ethylene

  4. tetrafluoroethylene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Teflon is a polymer of tetrafluoroethylene $\left({C} _{2}{F} _{4} \right)$, also known as polytetrafluoroethylene. It is a manmade polymer that has particular applications in manufactured products because of the chemical properties of Polytetrafluoroethylene.
Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Teflon, a polymer of tetrafluoroethylene, is an excellent plastic material for films and coatings. Which of the following is not the property of Teflon?

  1. It is unaltered by radiation

  2. It can withstand high temperatures

  3. It is one of the most chemically-resistant plastic in the world

  4. It is an ideal insulator for high-frequency fittings
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$PTFE$ (Poly tetra fluoro ethylene) is very sensitive and is therefore not suitable for applications involving exposure of any radiation as it will degrade.

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

Teflon (tetrafluoroethylene) is a black material used in non-stick pans for frying chips and vegetables. The oil or butter does not stick at all. In the process of manufacture, one of the technical problems is:

  1. to make teflon stick to the metal of the pan

  2. to make teflon that is non-sticky

  3. to make teflon

  4. to cut a round sheet of teflon that exactly fits
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Teflon even when melted do not flow instead it behaves as a gel due to absence of crystalline phase and high melting point so manufactures finds a bit difficulty to make teflon stick to metal of pan.

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

Identify $X$ in the reaction.


$CHCl _3 \xrightarrow[HF]{SbF _3} CHF _2Cl \overset{1070\, K}{\rightarrow} (X)+2HCl$

  1. $F _2C=CF _2$
  2. $ClFC=CFCl$
  3. $F _2C=CFCl$
  4. $F _2C=CCl _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When chloroform is treated with antimony trifluoride and $HF$, 2 chlorine atoms are replaced with 2$ F$ atoms. 


When $\displaystyle CHF _2Cl $ is heated to 1070 K, terafluoroethylene (compound X) is obtained. 

$\displaystyle 2CHF _2Cl \xrightarrow {1070K} F _2C=CF _2 $