Polymers Test

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Polymers Test - 22

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Question 1
1 / -0

Assertion (A) : The plants yield a milky suspension of crude rubber called latex.
Reason (R) : The latex contains about $$85\%$$ rubber.

A
Both A and R are correct and R is the correct explanation of the A

B
Both A and R are correct but R is not the correct explanation of the A

C
A is correct but R is incorrect

D
A is incorrect but R is correct

Solution

The plants yield a milky suspension of crude rubber called latex.
Latex is often described as the sap of the Hevea tree, a milky sticky substance.

The sap runs deeper inside the tree, beneath the cambium.
Latex runs in the latex ducts which are in a layer immediately outside the cambium. This highlights the skill of the tapper.

If the cambium is cut, then the tree is damaged because the cambium is where all the growth takes place.

The latex contains about $$60\%$$ of rubber and $$40\%$$ of other substances (water, proteins etc).

Assertion (A) is correct. Reason (R) is incorrect. Option C is correct.
Question 2
1 / -0

A. Natural rubber is an elastomer.
R. The inter-molecular forces of attraction between the polymer chains are weak vander Waals forces.

A
Both A and R are correct and R is the correct explanation of the A

B
Both A and R are correct but R is not the correct explanation of the A

C
A is correct but R is in correct

D
A is incorrect but R is correct

Solution

Natural rubber is an elastomer. It has low values of elasticity and tensile strength.
The inter-molecular forces of attraction between the polymer chains are weak vander Waals forces.
Hence, both A and R are correct and R is the correct explanation of the A
Question 3
1 / -0

A. Styrene is more reactive than propylene towards cationic polymerization

R. The carbocation resulting from styrene is more stable than that resulting from propylene.

A
Both A and R are correct and R is the correct explanation of the A

B
Both A and R are correct but R is not the correct explanation of the A

C
A is correct but R is incorrect

D
A is incorrect but R is correct
Question 4
1 / -0

Assertion(A): Nylon - $$6$$ is obtained by polymerization of caprolactam.
Reason(R): It is a polyamide.

A
Both A and R are correct and R is the correct explanation of the A.

B
Both A and R are correct but R is not the correct explanation of the A.

C
A is correct , but R is incorrect.

D
A is incorrect, but R is correct.

Solution

Nylon $$-6$$ is made from one monomer i.e; caprolactam.
It is a polyamide as it is formed by the following process,
Polymerization reaction initiates with ring opening of the lactam and then addition reaction occurs resulting in a polymer with linkage of an amino group of one molecule and a carboxylic acid of another group.
Question 5
1 / -0

STATEMENT-1 : PMMA (Polymethyl methacrylate) is used for making lenses and light covers.
STATEMENT-2 : It has excellent light transmission properties.

A
STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is a correct explanation for STATEMENT-1

B
STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1

C
STATEMENT-1 is True, STATEMENT-2 is False

D
STATEMENT-1 is False, STATEMENT-2 is True

Solution

PMMA (polymethyl methacrylate) is a widely commercially used bio-degradable polymer. It has excellent light transmission properties, due to which it is used for making lenses and light covers.
Question 6
1 / -0

(1) : For natural polymers, PDI value is always equal to unity.
(2) : The ratio of $$\bar{M_{w}}$$ and $$\bar{M_{n}}$$ of a polymer is called PDI.

A
Both 1 and 2 are correct and 2 is the correct explanation of the 1

B
Both 1 and 2 are correct but 2 is not the correct explanation of the 1

C
1 is correct but 2 is in correct

D
1 is incorrect but 2 is correct

Solution

For natural polymer, PDI (polymer dispersity index) is equal to $$1$$ because they are typically uniform and straight in length.
Question 7
1 / -0

Which one of the following sets form the biodegradable polymer?

A
$$H_2N - CH_2-COOH$$ and $$H_2N-(CH_2)_5-COOH$$

B

C

D
$$CH_2=CH - CN$$ and $$CH_2=CH - CH = CH_2$$

Solution

Biodegradable polymers are polymers which can be decomposed by bacteria.

Nylon $$2-$$nylon $$6$$ is a biodegradable polymer that can be formed by the monomers of glycine and aminocaproic acid.

$$nH_2N-CH_2-COOH+nH_2N-(CH_2)_5-COOH$$
$$\downarrow$$

$$\underset{Nylon \, 2-nylon \ 6}{-\!\!\!\!\left[HN - CH_2 - \underset{O}{\underset{||}{C}}-NH - (CH_2)_5 - \overset{O}{\overset{||}{C}}\right]_n\!\!\!\!\!\!\!\!\!-}$$

Hence, the correct option is $$A$$
Question 8
1 / -0

A: Polymethyl methacrylate is also known as plexi glass.
R: PMMA is used in decorative articles.

A
Both A and R are correct and R is the correct explanation of the A

B
Both A and R are correct but R is not the correct explanation of the A

C
A is correct but R is in correct

D
A is incorrect but R is correct

Solution

Polymethyl methacrylate is also known as plexi glass.
PMMA is polymethyl methaacrylate. It is an addition hopolymer of methyl methacrylate ($$\displaystyle CH_2 =C(CH_3)COOCH_3 $$).
PMMA is used in decorative articles, lenses, sign borads and aircraft windows.
Question 9
1 / -0

Generally, polyamides are _____.

A
fibres

B
thermoplastics

C
thermosetting

D
elastomeres

Solution

Polyamides are generally fibers because of the intermolecular forces like hydrogen bonding which gives them high tensile strength.
Question 10
1 / -0

List - I                                     List - II
A) Polystyrene    p) Condensation polymer
B) Polythene                         q) Thermoplastic polymer
C) Nylon- $$6, \:6$$ r) Polyamide
D) Terylene                         s) Addition polymer

A
(a - q,s), (b - q,s), (c - p,q,r), (d - p)

B
(a - p), (b - s), (c - p,r), (d - p,q)

C
(a - s), (b - q), (c - p,r), (d - q)

D
(a - q), (b - s), (c - r), (d - p,q)

Solution

The addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds, e.g., the formation of polythene from ethene and polypropene from propene. Addition polymers: Polyvinyl chloride, Polythene, Buna-S, Buna-N, etc.

Polystyrene is a synthetic aromatic polymer made from the monomer styrene.
It is addition polymer as it is made of addition of monomers.

The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units.

In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. take place. The examples are terylene (dacron), nylon 6, 6, nylon 6, etc. For example, nylon 6, 6 is formed by the condensation of hexamethylene diamine with adipic acid.

Hence, option A is correct.

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Polymers Test - 22

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Polymers Test - 22

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Question 1

Both A and R are correct and R is the correct explanation of the A

Both A and R are correct but R is not the correct explanation of the A

A is correct but R is incorrect

A is incorrect but R is correct

Solution

Question 2

Both A and R are correct and R is the correct explanation of the A

Both A and R are correct but R is not the correct explanation of the A

A is correct but R is in correct

A is incorrect but R is correct

Solution

Question 3

Both A and R are correct and R is the correct explanation of the A

Both A and R are correct but R is not the correct explanation of the A

A is correct but R is incorrect

A is incorrect but R is correct

Question 4

Assertion(A): Nylon - $$6$$ is obtained by polymerization of caprolactam.

Reason(R): It is a polyamide.

Both A and R are correct and R is the correct explanation of the A.

Both A and R are correct but R is not the correct explanation of the A.

A is correct , but R is incorrect.

A is incorrect, but R is correct.

Solution

Question 5

STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is False

STATEMENT-1 is False, STATEMENT-2 is True

Solution

Question 6

Both 1 and 2 are correct and 2 is the correct explanation of the 1

Both 1 and 2 are correct but 2 is not the correct explanation of the 1

1 is correct but 2 is in correct

1 is incorrect but 2 is correct

Solution

Question 7

$$H_2N - CH_2-COOH$$ and $$H_2N-(CH_2)_5-COOH$$

$$CH_2=CH - CN$$ and $$CH_2=CH - CH = CH_2$$

Solution

Question 8

Both A and R are correct and R is the correct explanation of the A

Both A and R are correct but R is not the correct explanation of the A

A is correct but R is in correct

A is incorrect but R is correct

Solution

Question 9

fibres

thermoplastics

thermosetting

elastomeres

Solution

Question 10

(a - q,s), (b - q,s), (c - p,q,r), (d - p)

(a - p), (b - s), (c - p,r), (d - p,q)

(a - s), (b - q), (c - p,r), (d - q)

(a - q), (b - s), (c - r), (d - p,q)

Solution

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