Polymers Test

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Polymers Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

Cellulose, protein and starch are classified as:

A
natural polymers

B
aldehydes

C
esters

D
synthetic polymers

Solution

Cellulose, protein and starch are classified as natural polymers. They are obtained from either plants or animals. They are named as plant polymers and animal polymers. Other examples of natural polymers include jute, linen, silk and wool etc.
Question 2
1 / -0

Which of the following type of forces are present in vulcanized rubber?

A
Weakest intermolecular forces

B
Hydrogen bonding

C
Three dimensional network of bonds

D
Metallic bonding

Solution

Vulcanised rubber is highly elastic, so weakest intermolecular forces present in it.
Question 3
1 / -0

The monomer for the given compound is:

A
2-methylpropene

B
Styrene

C
Propylene

D
Ethene

Solution

The monomer of the polymer is 2-methyl propene or isobutene.
Question 4
1 / -0

Which of the following is not a polymer?

A
Cholestrol

B
Oxytocin

C
Amylose

D
RNA

Solution

Cholesterol is a steroid. It is not a polymer. Oxytocin is a polyamide.
Amylose is a polysaccharide and RNA is a polymer of nucleotides.

Hence, option A is correct.
Question 5
1 / -0

The polymer used in making handles of cookers and frying pans is :

A
bakelite

B
nylon-2-nylon-6

C
orlon

D
polyvinyl chloride

Solution

The polymer used in making handles of cookers and frying pans is Bakelite. It is also used in making switches, combs etc. It is phenol formaldehyde polymer.
Question 6
1 / -0

Synthetic human hair wigs are made from a copolymer of vinyl chloride and acrylonitrile and is called:

A
PVC

B
Polyacrylonitrile

C
Cellulose

D
Dynel

Solution

Dynel is a co-polymer of vinyl chloride and acrylonitrile.
Question 7
1 / -0

Which type of polymer is the Buna-S-rubber?

A
Homo polymer

B
Condensation polymer

C
Copolymer

D
None of the above

Solution

Buna-S Rubber: It is a random co-polymer formed by the emulsion polymerisation of a mixture of 1,3 butadiene and styrene in the presence of peroxide catalyst at 5 degree Celsius and therefore the product is called as cold rubber.

Copolymer is the right answer.
Question 8
1 / -0

Which one of the following statements is wrong?

A
The repeating monomer units in bakelite are phenol and formaldehyde

B
Low density polythene is an example of branched chain polymers

C
Homopolymer contains a single type of monomer

D
Vulcanizatoin is the process of heating natural rubber with carbon

Solution

Vulcanization is the of heating natural rubber with sulphur in order to develop some specific qualities such as abrasion resistance, heat resistance and elasticity.

Hence, it is an incorrect statement.
Question 9
1 / -0

Find out the approximate amount of polythene formed from $$20$$kg of calcium carbide from the following reactions.

$$CaC_2+2H_2O\rightarrow Ca(OH)_2+C_2H_2$$

$$HC\equiv CH+H_2\xrightarrow{Pd\cdot BaSO_4}CH_2 =CH_2$$

$$nCH_2=CH_2\rightarrow \underset{Polythene}{(-CH_2-CH_2-)_n}$$

A
$$6$$g

B
$$9$$kg

C
$$26$$kg

D
$$29$$kg

Solution

Molecular weight of $$CaC_2=40+2\times 12=64$$

$$\because 64$$kg of $$CaC_2$$ gives $$=24+4=28$$kg of ethene.

$$\therefore 20$$kg of $$CaC_2$$ will give $$=\displaystyle\frac{28}{64}\times 20$$

$$=\displaystyle\frac{7\times 20}{16}=\frac{35}{4}$$

$$=8.75$$

$$=9$$kg polythene.
Question 10
1 / -0

What is not true regarding free radical polymerisation of propene?

A
Without proper control, atactic polypropylene is formed

B
Use of Ziegler-Natta catalyst results in isotactic polypropylene

C
During polymerisation, a linear unbranched, crystalline polymer is usually obtained

D
During polymerisation, a secondary free radical is produced in every step

Solution

The statement (C) is not true. During polymerization, a branched polymer is usually obtained . Chain branching always occur during olefenic polymerization due to abstraction of some H-radical from the growing polymer chain.

Note: $$\displaystyle 1^o$$ free radical forms $$\displaystyle 2^o$$ free radical by abstracting hydrogen at middle of another chain, which further adds to propene and there is growing of the branch. Ziegler Natta catalyst is titanium chloride and triethyl aluminum $$\displaystyle [TiCl_4+ Al(C_2H_5)_3]$$

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Polymers Test - 35

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Polymers Test - 35

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SHARING IS CARING

Question 1

natural polymers

aldehydes

esters

synthetic polymers

Solution

Question 2

Weakest intermolecular forces

Hydrogen bonding

Three dimensional network of bonds

Metallic bonding

Solution

Question 3

2-methylpropene

Styrene

Propylene

Ethene

Solution

Question 4

Cholestrol

Oxytocin

Amylose

RNA

Solution

Question 5

bakelite

nylon-2-nylon-6

orlon

polyvinyl chloride

Solution

Question 6

PVC

Polyacrylonitrile

Cellulose

Dynel

Solution

Question 7

Homo polymer

Condensation polymer

Copolymer

None of the above

Solution

Question 8

The repeating monomer units in bakelite are phenol and formaldehyde

Low density polythene is an example of branched chain polymers

Homopolymer contains a single type of monomer

Vulcanizatoin is the process of heating natural rubber with carbon

Solution

Question 9

$$6$$g

$$9$$kg

$$26$$kg

$$29$$kg

Solution

Question 10

Without proper control, atactic polypropylene is formed

Use of Ziegler-Natta catalyst results in isotactic polypropylene

During polymerisation, a linear unbranched, crystalline polymer is usually obtained

During polymerisation, a secondary free radical is produced in every step

Solution

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