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NEET Practice Questions (MCQs) with Answers & Solutions

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Which is/are true for elastomers?

These are synthetic polymers possessing elasticity

These possess very weak intermolecular forces of attractions between polymer chains

Vulcanised rubber is an example of elastomer

All of the above

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Explanation

All these are characteristics of elastomers.

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A copolymer of vinyl chloride and vinyl acetate is called:

vinylon

saran

dynel

orlon

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Explanation

(a) Vinylon is a copolymer of vinyl chloride and vinyl acetate.

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In vulcanisation of rubber:

sulphur reacts to form new compound

sulphur cross-links are introduced which resists wear and tear due to friction

sulphur forms a very thin protective layer over rubber

all of the statements are correct

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Explanation

(b) Vulcanisation is a process of treating natural rubber under heat and sulphur to develop sulphur cross-links and provide strength and resists wear and tear due to friction.

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The starting materials of PCTFE are:

monochloro trifluoro ethylene

tetrafluoroethylene

vinyl chloride

styrene

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Explanation

(a) PCTFE is polymer of chloro trifluoro ethylene.

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Chemical name of melamine is:

2,4-diamino-1,3,5-triazine

2-amino-1,3,5-triazine

2,4,6-triamino-1,3,5-triazine

1,3,5-triamino-2,4,6-triazine

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Explanation

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The abbreviation PDI refers to:

name of the polymer

polydispersity index of polymer

application of polymer

poly diagonal index

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Explanation

(b) PDI abbreviates as polydispersity index of polymer.

$PDI = \frac{M_{w}}{M_{n}} For natural polymers PDI = i . e ., M_{w} = M_{n} For synthetic polymers PDI > 1, i . e ., M_{w} = M_{n}$

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Caprolactam can be obtained from:

benzaldehyde

cyclohexane

benzophenone

adipic acid

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The monomer units of silicons a water repellant, acid resistant and heat resistant polymer is:

SiO₂

R₂SiO

none of these

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Explanation

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A polymer of prop-2-enenitrile is called

saran

orlon

dacron

tetron

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Explanation

(b) Orlon is a polymer of prop-2-ene nitrile or acrylonitrile or CH₂=CH-CN.

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Which one of the following pairs is not correctly matched?

Terylene—condensation polymer of terephthalic acid and ethylene glycol

Teflon—thermally stable cross-linked polymer of phenol and formaldehyde

Perspex—a homopolymer of methyl methacrylate

Synthetic rubber —a copolymer of butadiene and styrene

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Explanation

Teflon is a polymer of CF₂ = CF₂.

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