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Chemistry

HomeChemistryPage 17

31.

Ans. a (13)

Assertion : The time of vulcanisation and temperature is increased by adding accelerators. Reason : By vulcanising, a material of high tensile strength can be obtained.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If...

The biodegradable polymer is

a. Buna- s b. Nylon-6, 6 c. Nylon 2-nylon 6 d. Nylon- 6 Ans. c (14)

Which of the following polymer is biodegradable

Ans. c (7)

Assertion : 1, 3- Butadiene is the monomer for natural rubber. Reason : Natural rubber is formed through anionic addition polymerization.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If...

Assertion : Teflon has high thermal stability and chemical inerthness. Reason : Teflon is a thermoplastic

a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If...

Assertion : In Vulcanisation of rubber, sulphur cross links are introduced. Reason : Vulcanisation is a free radical initiated chain reaction.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion. b. If...

Which one of the following sets forms the biodegradable polymer

Ans. b (15)

Buna – S is a polymer of

a. Butadiene only b. Butadiene and styrene c. Sturene only d. Butadiene  nitryl Ans. b (16)

On complete hydrogenation, natural rubber produces

a. Ethylene- propylene copolymer b. Vulcanised rubber c. Polypropylene d. Polybutylene Ans.  a (8)

Ebonite is

a. Polropene b. Natural rubber c. Synthetic rubber d. Highly vulcanized rubber Ans. d (8)

Which of the following statement is correct regarding the drawbacks of raw rubber

a. It is plastic in nature b. It has little durability c. It has large water-absorption capacity d. All of...

What is the percentage of sulphur used in vulcanization of rubber

a. 05% b. 03% c. 30% d. 55.0% Ans. a (8)

Natural rubber has

a. All cis- configuration b. All trans-configuration c. Alternate cis – and trans-configuration d. Random cis-and trans-configuration Ans. a (9)

Buna – N synthetic rubber is a copolymer of

Ans. c (10)

Which of the following is used in vulcanization of rubber

a. SF6 b. CF4 c. Cl2 F2 d. C2 F2 Ans. a (15)

The synthetic polymer which resembles natural rubber is

a. Neoprene b. Chloroprene c. Glyptal d. Nylon Ans. a (9)

The monomer of natural polymer rubber is

a. Neoprene b. Isoprene c. Chloroprene d. Butadiene Ans. b (8)

Heating of rubber with sulphur is known as

a. Galvanisation b. Vulcanisation c. Bessemerisation d. Sulphonation Ans. b (12)

Neoprene (Synethetic Rubber) is a polymer of

a. propene b. Vinyl chloride c. Chloroprene d. Butadiene Ans.c (6)

The s – block element used as a catalyst in the manufacture of Buna – S rubber is

a.  Mg b. Ca c. Ba d. Na Ans. c (4)

Which of the following polymer is used in pigment

a. Buna – S b. Neoprene c.Teflon d. Orlon Ans. a (12)

Biodegradable polymer which can be

a. PHBV b. Buna- N c. Nylon 6, 6 d. Nylon 2- nylon 6 Ans. d (7)

which of the following is a biodegradable polymer

a. Cellulose b. Polythene c. Polyvinyl chloride d. Nylon -6 Ans. a (14)

‘Celanese silk’ is

a. Cellulose trinitrate b. Cellulose acetate c. Cellophane d. Pyroxylin Ans. b (7)

Which of the following is currently used as a tyre cord

a. Terylene b. Polyethylene c. Polypropylene d. Nylon- 6 Ans. d (12)

The polymer used for making contact lenses for eyes is

a. Polymethylmethacrylate b. Polyethylene c. Polyethylacrylate d. Nylon – 6 Ans. a (7)

Plexiglass is a commercial name of

a. Glyptal b. Polyacrylo nitrile c. Polythylacrylate d. Polyethyl acrylate Ans. a (52)

Which of the following has been used in the manufacture of non- inflammable photographic films

a.  Cellulose nitrate b. Cellulose acetate c. Cellulose xanthate d. Cellulose perchlorate Ans. b (6)

Which of the following statements about low density polythene is FALSE

a. It is poor conductor of electricity b. Its synthesis required dioxygen or a peroxide initiator as a catalyst c....

Polymer used in bullet proof glass is

a. Lexan b. PMMA c. Nomex d. Kevlar Ans. a (8)

Wash and wear clothes are manufactured using

a. Nylon fibres b. Cotton mixed with nylon c. Terylene fibres d. Wool fibres Ans. c (49)

Terylene is used for making

a. Silks b. Fabrics c. Seat belts d. All of these Ans. d (7)

Which polymer is used for making magnetic recording tapes

a. Dacron b. Acrilan c. Glytal d. Bakelite Ans. d (9)

Which one of the following is used to make ‘non-stick’ cookware

a. PVC b. polystyrene c. Polyethylene terephthalate d. Polyetrafloureothylene Ans. d (20)

The sterile gauze (or cotton) used in medicine is obtained by oxidising cellulose with

a. Nitrogen b. KMnO 4 c. Nitrogen dixide d. Potassium chlorate Ans. c (52)

The homopolymer formed from 4 – hydroxy- butanoic acid is

Ans. d (6)

The correct neme of the following polymer is

            a. Polyisobutana b. Polyert-butylene c. Polyisobutylene d. Polyisoprene Ans.c (10)

Which of the following compounds is a constituent of he polymer

  a. Methylamine b. N- Methyl urea c. Formaldehyde d. Ammonia Ans.c (7)

The structure of Nylon -6 is

Ans. c (22)
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