CBSE Class 12 Chemistry Polymers VBQs

Question. The turbidity of a polymer solution measures
(a) the light scattered by a solution
(b) the light absorbed by a solution
(c) the light transmitted by a solution
(d) none of the above
Answer : A

Question. —[NH(CH₂)₆NHCO(CH₂)₄CO—]_n is a
(a) addition polymer
(b) thermosetting polymer
(c) homopolymer
(d) copolymer
Answer : D

Question.  Which one of the following sets forms the biodegradable polymer?
(a) CH₂ = CH – CN and CH₂ = CH – CH = CH₂
(b) H₂N – CH₂ – COOH and H₂N–(CH₂)₅ – COOH
(c) HO – CH₂ – CH₂ – OH and

Answer : B

Question. PVC is a
(a) thermoplastic polymer
(b) compound polymer
(c) thermosetting polymer
(d) simple polymer
Answer : A

Question. Which of the following polymers do not involve cross linkages?
(a) Melmac
(b) Bakelite
(c) Polythene
(d) Vulcanised rubber
Answer : C

Question. Which one of the following is not an example of chain growth polymer?
(a) Neoprene
(b) Buna-S
(c) PMMA
(d) Glyptal
Answer : D

Question. The condensation of hexamethylenediamine with sebacoyl chloride at 525 K gives
(a) nylon-6,20
(b) nylon-6,01
(c) nylon-6,10
(d) none of these
Answer : C

Question. Statement-1 : Vinylidene chloride forms isotactic, syndiotactic and atactic polymers.
Statement-2 : Vinylidene chloride does not contain chiral carbon.
(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
Answer : D

Question. The synthetic polymer which resembles natural rubber is
(a) neoprene
(b) chloroprene
(c) glyptal
(d) nylon
Answer : A

Question. Which of the following statements is false?
(a) Artificial silk is derived from cellulose.
(b) Nylon-66 is an example of elastomer.
(c) The repeat unit in natural rubber is isoprene.
(d) Both starch and cellulose are polymers of glucose.
Answer : B

Question. On the basis of mode of formation, polymers can be classified?
(a) as addition polymers only
(b) as condensation polymers only
(c) as copolymers
(d) both as addition and condensation polymers
Answer : D

Question. Structure of some important polymers are given. Which one represents buna-S?

Answer : B

Question.  The process of heat-softening, moulding and cooling to rigidness can be repeated for which plastics
(a) thermoplastics
(b) thermosetting plastics
(c) both (a) and (b)
(d) neither (a) nor (b)
Answer : A

Question. Which of the following is not a biopolymer ?
(a) Proteins
(b) Rubber
(c) Cellulose
(d) RNA
Answer : B

Question.  The monomer(s) used in the preparation of orlon, a substitute for wool is/are
(a) caprolactam
(b) tetrafluoroethene
(c) styrene and 1, 3-butadiene
(d) acrylonitrile
Answer : D

Question. Polymer obtained by condensation polymerization is
(a) Polythene
(b) Teflon
(c) Phenol-formaldehyde
(d) Nitrile rubber
Answer : C

Question. Polyvinyl alcohol can be prepared by
(a) polymerization of vinyl alcohol
(b) alkaline hydrolysis of polyvinyl acetate
(c) polymerization of acetylene
(d) reaction of acetylene with H₂SO₄ in presence of HgSO₄
Answer : B

Question. Which one of the following statement is not true?
(a) In vulcanization the formation of sulphur bridges between different chains make rubber harder and stronger.
(b) Natural rubber has the trans -configuration at every double bond.
(c) Buna-S is a copolymer of butadiene and styrene.
(d) Natural rubber is a 1, 4 - polymer of isoprene.
Answer : B

Question. Which of the following is not correctly matched?

Answer : A

Question. Match List-I (Monomer) with List II (Polymer) and select the correct answer using the codes given below the lists:
              List I                              List II
I. Hexamethylenediamine        A. Bakelite
II. Phenol                                 B. Dacron
III. Phthalic acid                      C. Glyptal
IV. Terephthalic acid                D. Melamine
E. Nylon
Codes:
(a) I-E, II-A, III-B, IV-C
(b) I-E, II-A, III-C, IV-B
(c) I-D, II-C, III-A, IV-B
(d) I-D, II-C, III-B, IV-A
Answer : B

Value Based Questions

1) At a sweet shop in Hyderabad, Rishi bought some sweets. He requested the sales boy to put the sweets in a polythene bag. The sales boy refused to do so, instead he kept the sweet box in a paper bag.

After reading the above passage, answer the following questions.

Question. Why did the sales boy refuse to put the sweet box in a polythene bag?
Answer: Polythene is banned because of being non-degradable

Question. As a student of chemistry, why would you advocate the use paper bags instead of polythene bags? Which value is promoted through the use of paper bag?
Answer: Use of polythene bags results in pollution as polythene is non-biodegradable value: Reducing environmental pollution, concern for environmental protection

Question. suggest two activities to promote these values
Answer: Organising mass campaigns for spreading awareness/ use of mass media to educate people

2) While returning from school, Akash witnesses an accident on road. A young man had suffered injuries due to skidding of his bike. Akash rushed to the aid of the youngman along with some more people . While some people took the young man to a nearby hospital. Akash tried to find out the reason behind Skidding of the bike. He found out that the bike skidded due to oil spilled on road. He then arranged for an old cloth and wiped the oil from the road.

Question. Mention the values shown by the student in the above case
Answer: Values: Social responsibility, empathy

Question. What otherways can be employed to remove the oil spill other than wiping with a cloth?Explain the mechanism A:
Answer: The oil spill can also be removed by washing it with soap water. Soap is sodium or potassium salt of higher fatty acids. Soap molecules form Micelles around the oil droplets such that the hydrophobic part is in the oil and hydrophilic part projects out of the droplet. Thus, the oil droplets are pulled in water and removed. 

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