Tag: polymers

Questions Related to polymers

A polymer which is used as a suture, i.e., for stiching of wounds after operations is 

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. PHBV

  2. nylon-2-Nylon-6

  3. dextran

  4. dacron

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Correct Option: C

Which of the following is used in conveyor belt?

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. PVC

  2. Polythene

  3. Neoprene

  4. none of these

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Correct Option: A,B,C
Explanation:

In order to move the belt and the material to transport one or both the pulleys should be power-driven. These belts are generally made of rubber, PVC, Urethane, Neoprene, Nylon, Nitrile, Polyester, leather, polythene and others. The industrial conveyor belts are made up of multiple layers of material.


Hence, the correct options are $\text{A}, \text{B}$ and $\text{C}$

If a polythene sample contains two monodisperse fractions in the ratio $2:3$ with degree of polymerization $100$ and $200$, respectively, then its weight average molecular weight will be:

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. $4480$

  2. $4600$

  3. $4300$

  4. $5200$

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Correct Option: A

Which of the following is not true?

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. Step growth polymerisation required a bifunctional monomer.

  2. Nylon $6$ is an example of step- growth polymerisation

  3. Nylon $6$ is an example of Chain growth polymerisation.

  4. Chain growth polymerisation involves homopolymerisation only.

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Correct Option: B

Arrange the following polymers in the order of their intermolecular forces?


Nylon-6,6 $(P)$, Buna-S $(Q)$, and Polythene $(R)$ 

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. $Q>R>P$

  2. $P>R>Q$

  3. $Q>P>R$

  4. $P>Q>R$

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Correct Option: B

Zeifler-Natta catalystic system is a combination of :

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. $Rh(Ph _{3}P) _{3}CI$ and $H _{2}$

  2. $Ti(O^{i}Pr) _{4}$ and $^{t}BuOOH$

  3. $Rh(Ph _{3}P) _{3}CI$ and $CO$

  4. $TiCI _{4}$ and $AI(C _{2}H _{2}) _{3}$

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Correct Option: D

Monomers of Natural Rubber and Neoprene are Respectively : 

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. $CH _3 - \underset{CH _3}{\underset{|}{C}} = CH - CH _3 , \, \, CH _3 - \underset{Cl}{\underset{|}{C}} = CH - CH _3$

  2. $CH _2 = \underset{CH _3}{\underset{|}{C}} - CH = CH _2$ $CH _2 = \underset{Cl}{\underset{|}{C}} - CH = CH _2$

  3. $CH _2 = CH - CH = CH _2$ , $CH _2 = CH - Cl$

  4. $CH _2 = \underset{Cl}{\underset{|}{C}} - CH = CH _2$ $CH _2 = \underset{CH _3}{\underset{|}{C}} - CH = CH _2$

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Correct Option: B
Explanation:

CH2=C|CH3−CH=CH2monomerofneutralrubberCH2=C|CH3−CH=CH2monomerofneutralrubber             CH2=C|Cl−CH=CH2monomerofneoprene

Which of the following substance is not a covalent polymer?

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. Silica

  2. Diamond

  3. Glucose

  4. Silicon carbide

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Correct Option: C
Explanation:

Silica  - giant polymer with basic unit $SiO _2$.
Diamond - a polymer with a basic unit carbon atom.
Glucose - $C _6 H _{12} O _6$ is not a polymer.
Silicon carbide (SiC) - a polymer with basic SiC.

Polymerisation may occur through intermediate formation of___________.

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. carbocations

  2. carbanions

  3. free radicals

  4. carbenes

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Correct Option: A,B,C
Explanation:

Polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks. There are many forms of polymerization like free radical electrophilic and nucleophile polymerisations through the formation of free radicals, carbanions and carbocation intermediates. Carbene doesn't form in the reaction mechanism as intermediate.
Hence, options A, B and C are correct.

State True or False.

The presence of double bonds in rubber molecules influence their structure and reactivity.

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

The given statement is true.
The presence of double bonds in rubber molecules influence their structure and reactivity.
In natural rubber, double bonds have cis configuration. Hence, the chains do not come closer this results in weak intermolecular attractions. Natural rubber has coiled structure, it is elastic and non-crystalline. 
In gutta-percha(synthetic rubber) double bonds have trans configuration. The zig-zag chains pack more closely. It is highly crystalline, non elastic, hard & brittle.