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NEET Practice Questions (MCQs) with Answers & Solutions

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Natural rubber has

All trans-configuration

Alternate cis - and trans-configuration

Random cis - and trans-configuration

All cis-configuration

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

nylon 2-nylon 6

PHBV

buna-N

nylon-6, 6

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Caprolactam is used for the manufacture of

nylon-6

tetion

terylene

nylon-6 6

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Which of the following organic compounds polymerizes to form the polyester dacron?

Propylene and para HO — (C₆H₄)—OH

Benzoic acid and ethanol

Terephthalic acid and ethylene glycol

Benzoic acid and para HO — (C₆H₄)—OH

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Which of these is not a monomer for a
high molecular mass silicone polymer?

MeSiCl₃

Me₂SiCl₂

Me₃SiCl

PhSiCl₃

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Which is the monomer of neoprene in the following?

CH₂=CH-c=CH

CH₂= $\begin{matrix} \underset{|}{C} \\ {CH}_{3} \end{matrix}$ -CH=CH₂

$\begin{matrix} {CH}_{2} & = & \underset{Cl}{\underset{|}{C}} & - & CH & = & {CH}_{2} \end{matrix}$

CH₂=CH-CH=CH₂

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The straight chain polymers formed by:-

hydrolysis of (CH₃)₃SiCl followed by condensation polymerisation

hydrolysis of CH₃SiCl₃ followed by condensation polymerisation

hydrolysis of (CH₃)₄Si by addition polymerisation

hydrolysis of (CH₃)₂SiCl₂ followed by condensation polymerisation

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Which one of the following statements is not true?

In vulcanisation, the formation of sulphur bridges between

different chains make rubber harder and stronger.

Natural rubber has the trans-configuration at every double bond.

Buna-S is a copolymer of butadiene and styrene.

Natural rubber is a 1,4-polymer of isoprene.

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Explanation

(b) Natural rubber is cis-polyisoprene and is prepared from latex which is obtained from rubber tree (Hevea brasiliensis)

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Which one of the following polymers prepared by condensation polymerization ?

Nylon-66

Teflon

Rubber

Styrene

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[NH(CH)₂NHCO(CH₂)₄CO]_nis a:

co-polymer

addition polymer

thermo-setting polymer

homopolymer

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Explanation

(a) [NH(CH)₂NHCO(CH₂)₄CO]_n is a copolymer because polymers whose repeating structural units are derived form two or more types of monomer units are called copolymer.

nH₂N(CH₂)NH₂ + nHOOC(CH₂)₄COOH $\to_{- {nH}_{2} O}^{Polymerisation}$ [NH(CH₂)NHCO(CH₂)₄CO]_n

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