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NEET • CHEMISTRY • POLYMERS

Polymers practice · Medium

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Showing 31-48 of 48 questions

31 Medium

31 of 48

Understanding +4 | -1

Which of the following is not a semisynthetic polymer?

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Correct option: A

Cis - polyisoprene

Option A (Cis - polyisoprene) is correct because cis-polyisoprene (natural rubber) is a natural polymer, not a semisynthetic one.

32 Medium

32 of 48

Analyzing +4 | -1

Assertion: Branched polymers have higher tensile strength than linear polymers.

Reason: The intermolecular force of attraction in linear polymer is more than that in branched polymers.

View answer and explanation

Correct option: D

Assertion is wrong, but reason is correct statement.

Option D is correct because branched polymers have lower tensile strength due to weaker intermolecular forces compared to linear polymers.

33 Medium

33 of 48

Remembering +4 | -1

The polymer obtained by condensation of sebacic acid and hexamethylenediamine is named as

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Correct option: A

Nylon-6

Option D is correct because Nylon-6,10 is formed from hexamethylenediamine (6 carbons) and sebacic acid (10 carbons).

34 Medium

34 of 48

Application +4 | -1

A polymer consist of 8 atoms of sulphur per molecule which is

2 \%

by mass, The molar mass of the polymer is

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Correct option: B

12800 \mathrm{~g} \mathrm{~mol}^{-1}

Option B (

12800 \mathrm{~g} \mathrm{~mol}^{-1}

) is correct because if 8 sulfur atoms constitute 2% of the polymer's mass, then the total molar mass can be calculated.

35 Medium

35 of 48

Understanding +4 | -1

Which statement regarding polymers is not correct?

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Correct option: A

Thermosetting polymers are reusable

Option A (Thermosetting polymers are reusable) is correct because thermosetting polymers undergo irreversible changes upon heating and cannot be remelted or reshaped.

36 Medium

36 of 48

Remembering +4 | -1

The polymer which has conducting power is

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Correct option: D

Polyacetylene

Option D (Polyacetylene) is correct because polyacetylene can be doped to become a conducting polymer.

37 Medium

37 of 48

Understanding +4 | -1

Identify the pair of condensation polymers from the following

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Correct option: B

Terylene and Nylon – 6, 6

Option B (Terylene and Nylon – 6, 6) is correct because both are formed through condensation reactions, eliminating small molecules.

38 Medium

38 of 48

Remembering +4 | -1

Which of the following is polycarbonate?

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Correct option: B

Lexan

Option B is correct because Lexan is a polycarbonate, known for its strength and impact resistance.

39 Medium

39 of 48

Understanding +4 | -1

Polyvinyl alcohol can be prepared by

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Correct option: B

Alkaline hydrolysis of polyvinyl acetate

Option B (Alkaline hydrolysis of polyvinyl acetate) is correct because polyvinyl alcohol is synthesized by hydrolyzing polyvinyl acetate.

40 Medium

40 of 48

Understanding +4 | -1

Natural rubber is not used in making footwear for polar regions because

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Correct option: B

Natural rubber becomes brittle at temperature lower than

10^\circ \mathrm{C}.

Option B is correct because natural rubber becomes brittle at low temperatures, making it unsuitable for footwear in polar regions.

41 Medium

41 of 48

Understanding +4 | -1

Which of the following pairs is not correctly matched?

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Correct option: B

Teflon-thermally stable cross linked polymer of phenol and formaldehyde

Option B (Teflon-thermally stable cross linked polymer of phenol and formaldehyde) is not correctly matched because Teflon is a polymer of tetrafluoroethylene, while cross-linked polymers of phenol and formaldehyde are Bakelite.

42 Medium

42 of 48

Understanding +4 | -1

Which of the following practices involves green chemistry?

(i) Substitute

CFCs

by environmental friendly

HFCs

and other compounds

(ii) Replace halogenated solvent by liquid

{CO}_2

for drycleaning

(iii) Use of

{H}_2 {O}_2

for bleaching instead of

{Cl}_2

(iv) Making disposable eating utensils and storage jars of plastics

View answer and explanation

Correct option: D

(i),(ii) and (iii)

Option D ((i),(ii) and (iii)) is correct because all three practices reduce environmental harm by using safer alternatives.

43 Medium

43 of 48

Remembering +4 | -1

Buna –N- synthetic rubber is a copolymer of

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Correct option: C

{\mathrm{H}_2}\mathrm{C} = \mathrm{CH} - \mathrm{CN\;and\;}{\mathrm{H}_2}\mathrm{C} = \mathrm{CH} - \mathrm{CH} = \mathrm{C}{\mathrm{H}_2}

Option C (

{\mathrm{H}_2}\mathrm{C} = \mathrm{CH} - \mathrm{CN\;and\;}{\mathrm{H}_2}\mathrm{C} = \mathrm{CH} - \mathrm{CH} = \mathrm{C}{\mathrm{H}_2}

) is correct because Buna-N rubber is a copolymer of 1,3-butadiene and acrylonitrile.

44 Medium

44 of 48

Remembering +4 | -1

A process that involves the union of two or more molecules to form a new molecular aggregate without losing any simple molecule is known as:

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Correct option: B

Polymerisation

Option B (Polymerisation) is correct because polymerization is the process of joining monomers to form a polymer without losing small molecules.

45 Medium

45 of 48

Understanding +4 | -1

Assertion:- Bakelite is a thermosetting polymer.

Reason:- It has highly branched structure.

View answer and explanation

Correct option: B

If both assertion & reason true but reason is not a correct explanation of the assertion

Option B (If both assertion & reason true but reason is not a correct explanation of the assertion) is correct because Bakelite is thermosetting and has a branched structure, but the branching isn't the *direct* cause of it being thermosetting.

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46 Medium

46 of 48

Remembering +4 | -1

Biodegradable polymer which can be produced from glycine and aminocaproic acid is

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Correct option: D

Nylon 2-nylon 6

Option D (Nylon 2-nylon 6) is correct because it is a biodegradable polymer made from glycine and aminocaproic acid.

47 Medium

47 of 48

Understanding +4 | -1

Which of the following sets are correct regarding polymer?
(A) Copolymer: Buna-S , (B) Condensation polymer: Nylon-6, 6 , (C) Fibres: Nylon-6, 6, (D) Thermosetting polymer: Terylene, (E) Homopolymer: Buna-N
Choose the correct answer from given options below:

View answer and explanation

Correct option: A

(A), (B) and (C) are correct

Option A ((A), (B) and (C) are correct) is correct because Buna-S is a copolymer, Nylon-6,6 is a condensation polymer, and Nylon-6,6 is a fiber.

48 Medium

48 of 48

Understanding +4 | -1

Select the incorrect statement out of the
following related to synthetic rubber.

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Correct option: C

All synthetic rubbers always contain
ethane or its derivatives

Option C (All synthetic rubbers always contain ethane or its derivatives) is correct because not all synthetic rubbers are based on ethane or its derivatives; some are based on butadiene or other monomers.

Revision notes and key takeaways

Review POLYMERS in your textbook or class notes, then use this set to check your understanding.

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