Tag: polymers

Questions Related to polymers

Process of conversion of wood into coal by biochemical process, taking over millions of years is called:

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. catenation

  2. carbonation

  3. pyrolysis

  4. destructive distillation

Show answer
Correct Option: B
Explanation:

The Process of conversion of wood into coal by biochemical process is known as Carbonization. Coal burns cleaner than wood burning coal was easier because coal burned longer than wood.

Carbonization is the term for the conversion of an organic substance into carbon or a carbon-containing residue through pyrolysis or destructive distillation. It is often used in organic chemistry with reference to the generation of coal gas and coal tar from raw coal.

When super heated steam is passed through white hot wood charcoal, it gets reduced to a mixture of $X, Y$ and this reaction is named as $Z$. Identify $Y$.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. $C{O} _{2}$

  2. $S{O} _{2}$

  3. ${H} _{2}$

  4. $N{O} _{2}$

Show answer
Correct Option: C
Explanation:
$X + Y \longrightarrow CO + H _2(water-gas)$
$X = CO$
$Y = H _2$
$XY = water- gas (CO + H _2)$ reaction is exothermic.

$Z$ is known as $carbonisation$ reaction.
Hence, the correct option is C.

When super heated steam is passed through red hot wood charcoal, it gets reduced to a mixture of $X$ and $Y$ and this mixture is named as $Z$. Identify the mixture $Z$.

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Producer gas

  2. Water gas

  3. Coal gas

  4. Soda water

Show answer
Correct Option: B
Explanation:

When super heated steam is passed through hot wood charcoal then reaction takes place as


$C + H _2O \rightarrow CO + H _2$

The combination of $CO$ and $H _2$ is known as water gas.

${ C } _{ 12 }{ H } _{ 22 }{ O } _{ 11 }\xrightarrow { \quad \quad Conc.{ H } _{ 2 }S{ O } _{ 4 }\quad \quad  } 12C+11{ H } _{ 2 }O$
Which of the following is obtained by the above reaction?

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. Animal charcoal

  2. Sugar charcoal

  3. Coke

  4. Wood charcoal

Show answer
Correct Option: B
Explanation:

Sugar when treated with con. $H _2SO _4$ it gives carbon as sugar charcoal and water.

${ C } _{ 12 }{ H } _{ 22 }{ O } _{ 11 }\xrightarrow { \quad \quad Conc.{ H } _{ 2 }S{ O } _{ 4 }\quad \quad  } 12C+11{ H } _{ 2 }O$

In the preparation of wood charcoal, liquid pyroligneous acid is obtained. It consists of:

allotropes of carbon chemistry occurrence of carbon compounds in nature polymers

  1. acetone

  2. methanol

  3. acetic acid

  4. Vinegar

Show answer
Correct Option: A,B,C
Explanation:

In the preparation of wood charcoal, liquid pyroligneous acid is obtained. It consists of acetone, methanol and acetic acid.

Teflon and Neoprene are the example of:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. copolymer

  2. monopolymer

  3. homopolymer

  4. condensation polymer.

Show answer
Correct Option: B,C
Explanation:

Teflon is homopolymer of monomeric units of tetra-fluoro-ethene

$CF _2=CF _2$
Neoprene is homopolymer of monomeric units of chloroprene [ $2-chloro-1,3-butadiene$].
so these are homopolymer and monomers, correct option is [B,C].

Which of the following sets contain only addition homopolymers?

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. Polythene, Natural rubber, Cellulose

  2. Nylon, Polyester, Melamine resin

  3. Teflon, Bakelite, Orlon

  4. Neoprene, PVC, Polythene

Show answer
Correct Option: A,D
Explanation:

On the basis of mode of polymerization, polymers can be classified into two types:-

[1] Addition polymer
[2] Condensation polymer
Addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds. However, the addition polymers formed by the polymerization of a single monomeric species are known as homopolymers.
Example= Polythene: Made from the polymerization of ethene
Natural rubber: Made from the polymerization of cis-1,4-polyisoprene
Cellulose: Made from the polymerization of $\beta$ D- glucose
Neoprene: Made from the polymerization of chloroprene
PVC: Made from the polymerization of vinyl chloride

On complete hydrogenation, natural rubber produces:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. ethylene-propylene copolymer

  2. vulcanized rubber

  3. polypropylene

  4. polybutylene

Show answer
Correct Option: A
Explanation:

Natural rubber forms due to polymerisation of isoprene and on hydrogenation provide a polymer of the ethylene-propylene copolymer.


Hence, option A is correct.

Polymerisation in which two or more chemically different monomers take part is called 

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. addition polymerisation

  2. copolymerisation

  3. chain polymerisation

  4. homopolymerisation

Show answer
Correct Option: B
Explanation:

Addition polymerisation - In this type of polymerisation, the molecules of the same monomer or different monomers add together on a large scale to form a polymer.
Copolymerisation - Copolymerisation is a polymerisation reaction in which a mixture of more than one monomeric species is allowed to polymerise to form a copolymer.
Chain polymerisation - Chain polymerisation or chain growth polymerisation is a polymerisation technique, where unsaturated monomer molecules add on to the active site on a growing polymerisation one at a time.
Homopolymerisation - Homopolymerisation is the polymerisation of a single type of monomer to form a homopolymer.

Buna-S is a copolymer of:

copolymerisation types of polymerisation reactions polymer polymers chemistry

  1. styrene and $1,:3$ - butadiene

  2. styrene and ethylene

  3. $1,:3$ - butadiene and ethylene

  4. $1,: 3$ - butadiene and acrylonitrile

Show answer
Correct Option: A
Explanation:

Buna-S is formed from styrene and $1,:3$ - butadiene.
The reaction is shown below:
$nCH _2=CH-CH=CH _2 + nC _6H _5CH=CH _2 \rightarrow -(CH _2-CH=CH-CH _2-CH _2-CH(C _6H _5)) _n-$