Organic Chemistry C. Polymer

Total Questions: 37

11. Select the incorrect statement out of the following: [67th B.P.S.C. (Pre) 2022]

(a) Cotton fibre is useful for use as clothing in summer because it absorbs moisture.
(b) Polycarbonate is used for making CDs.
(c) Acrylic is also called artificial silk as it is prepared from cotton but has shine like silk.
(d) Teflon is used for coating non-stick kitchenware.
(e) None of the above/More than one of the above

Correct Answer: (c) Acrylic is also called artificial silk as it is prepared from cotton but has shine like silk.

Solution:Rayon is soft, lustrous, and absorbent, which exactly copies the characteristics of silk. Rayon appears and feels like silk. Hence, Rayon is called artificial silk. Fibre obtained by chemically treating wood pulp is called Rayon or artificial silk. Acrylic fibres are synthetic fibres that resemble natural wool. Statements of other options are correct.

12. Which of the following polymer is NOT a thermoplastic? [U.P. P.C.S. (Pre) 2020]

(a) Teflon
(b) Neoprene
(c) Polystyrene
(d) Polythene

Correct Answer: (b) Neoprene

Solution:Neoprene is a family of synthetic rubbers that are produced by polymerization of chloroprene. It is used to prepare pipes, belts, and other things. Neoprene is a thermosetting polymer, meaning it does not soften upon heating. It is also called polychloroprene or PC-rubber.

Among the given options, neoprene is not a thermoplastic. Thermoplastics soften when heated and harden when cooled. Teflon, polystyrene, and polythene are thermoplastics.

13. Which one of the following polymers is not biodegradable? [U.P. R.O./A.R.O. (Pre) 2017]

(a) Cellulose
(b) Starch
(c) Protein
(d) PVC

Correct Answer: (d) PVC

Solution:PVC (Polyvinyl chloride) is a synthetic polymer of vinyl chloride which is not biodegradable, while cellulose, starch, and protein are natural polymers and are biodegradable.

14. Which one of the following is used in the synthesis of polythene? [R.A.S./R.T.S. (Pre) 2008]

(a) Methane
(b) Ethane
(c) Propane
(d) Butane

Correct Answer: (b) Ethane

Solution:Polythene is produced by the polymerization of ethylene, which is derived from ethane.

15. Which one of the following gases is used in manufacturing of polythene? [U.P. R.O./A.R.O. (Mains) 2021]

(a) Ethylene
(b) Carbon dioxide
(c) Nitrogen
(d) Carbon monoxide

Correct Answer: (a) Ethylene

Solution:Polythene is produced by the polymerization of ethylene. Hence, it is a polymer of ethylene.

16. Which gas is obtained from plastic? [Uttarakhand P.C.S. (Pre) 2010]

(a) Polytinrogene
(b) Polyhydrogen
(c) Polychlorine
(d) Polyethylene

Correct Answer: (d) Polyethylene

Solution:Polyethylene gas is produced from plastic.

17. With reference to polyethylene terephthalate, the use of which is so widespread in our daily lives, consider the following statements: [I.A.S. (Pre) 2022]

Its fibres can be blended with wool and cotton fibres to reinforce their properties.
Containers made of it can be used to store any alcoholic beverage.
Bottles made of it can be recycled into other products.
Articles made of it can be easily disposed of by incineration without causing greenhouse gas emissions.

Which of the statements given above are correct?

(a) 1 and 3
(b) 2 and 4
(c) 1 and 4
(d) 2 and 3

Correct Answer: (a) 1 and 3

Solution:Polyethylene terephthalate (PET or PETE) is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, and thermoforming for manufacturing, and in combination with glass fibre for engineering resins. It is often used in durable-press blends with other fibres such as rayon, wool, and cotton, reinforcing the inherent properties of those fibres.

PET containers are not suitable for storing alcoholic beverages due to leaching risks.

Incineration of PET releases greenhouse gases.

18. Which one of the following polymers is used in making bullet-proof vests? [U.P.P.C.S. (Mains) 2014]

(a) Bakelite
(b) Polyamides
(c) Teflon
(d) Polyurethanes

Correct Answer: (b) Polyamides

Solution:Kevlar is a material commonly used to make bulletproof vests. Kevlar is a para-aromatic polyamide (Poly-Paraphenylene Terephthalamide) synthetic fiber. It contains lots of inter-chain bonds which make it extremely strong. Layers of laminated glass are also used for making bulletproof materials.

19. What is the 'fibre' used to make bulletproof jackets? [69th B.P.S.C. (Pre) 2023]

(a) Nylon
(b) Terylene
(c) Tweed
(d) Kevlar

Correct Answer: (d) Kevlar

Solution:Kevlar is a material commonly used to make bulletproof jackets. Kevlar is a para-aromatic polyamide (Poly-Paraphenylene Terephthalamide) synthetic fiber. It contains lots of inter-chain bonds which make it extremely strong. Layers of laminated glass are also used for making bulletproof materials.

20. Which of the following polymers is used in the manufacture of bulletproof material? [Jharkhand P.C.S. (Pre) 2010]

(a) Nylon 6, 6
(b) Rayon
(c) Kevlar
(d) Dacron

Correct Answer: (c) Kevlar

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