Class 12 Chemistry Sample Paper With Solutions Set C

Please refer to Class 12 Chemistry Sample Paper With Solutions Set C below. These Class 12 Chemistry Sample Papers will help you to get more understanding of the type of questions expected in the upcoming exams. All sample guess papers for Chemistry Class 12 have been designed as per the latest examination pattern issued by CBSE. Please practice all CBSE Sample Papers for Chemistry in Standard 12.

Sample Paper Class 12 Chemistry With Solutions Set C

Very Short Answer-Objective Type Questions.

A. Multiple choice Questions:

Question. Which of the following polymers of glucose is stored by animals?
(a) Cellulose
(b) Amylose
(c) Amylopectin
(d) Glycogen

Question. Which of the following is not a semisynthetic polymer?
(a) cis-polyisoprene
(b) Cellulose nitrate
(c) Cellulose acetate
(d) Vulcanised rubber

Question. The commercial name of polyacrylonitrile is______________.
(a) Dacron
(b) Orlon (acrilan)
(c) PVC
(d) Bakelite

Question. Which of the following polymer is biodegradable?

Question. Which of the following statements is not true about low density polythene?
(a) Tough
(b) Hard
(c) Poor conductor of electricity
(d) Highly branched structure

B. Match the following :

Question. Match the species given in Column I with those mentioned in Column II.
Column I                        Column II
(Polymers)                  (Chemical name)
(a) Nylon 6                 (i) Polyvinyl chloride
(b) PVC                      (ii) Polyacrylonitrile
(c) Acrilan                  (iii) Polycaprolactam
(d) Natural rubber       (iv) Low density polythene
(e) LDP                       (v) cis-polyisoprene
Answer. 
(a) → (iii)
(b) → (i)
(c) → (ii)
(d) → (v)
(e) → (iv)

C. Answer the following:

Question. Which of the following is natural polymer.Buna-S, Protein, PVC ? 
Answer. Protein. 

Question. Based on molecular forces what type of polymer is neoprene ? 
Answer. Elastomer. 

Question. Which of the following is a fibre : Nylon, Neoprene, PVC ? 
Answer. Nylon. 

Question. Give one example of condensation polymer.
Answer. Nylon – 6, 6. 1

Question. Define the term homopolymerisation giving an example. 
Answer. Homopolymerisation : The polymers formed by the polymerisation of single monomeric species are known as homopolymers and the process is known as homopolymerisation. e.g., formation of polyethene.

Question. Draw the structure of the monomer for the following polymer :
(i) Polypropene. 
Answer. (i) CH₂ = CH—CH₃ (Propene) is the monomer for polypropene. 

Question.

a homopolymer or copolymer ?
Answer. Homopolymer, because it contains single type monomer unit. i.e.,

undergoes polymerisation.

Question. Is

a homopolymer or copolymer ?

Answer. It is a homopolymer because single type of monomer unit i.e., C₆H₅ – CH = CH₂ undergoes polymerisation. 

Question. Write the name of the biodegradable polymer used in orthopaedic devices.
Answer. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)

Question. Why are rubbers called elastomers ?
Answer. Rubber are stretched on application of force and come to its original position after the force is removed. Therefore, these are called elastomers. 

Question. Which factor imparts crystalline nature to a polymer like nylon ? 
Answer. Strong intermolecular forces like hydrogen bonding and linear structure lead to close packing of polymer chains that imparts crystalline character.

Short Answer Type Questions 

Question. Define the thermoplastic and thermosetting polymers. Give one example of each.
Answer. Thermoplastics : Thermoplastics are the ones in which intermolecular forces of attraction are intermediate of those of elastomers and fibres. 
e.g., Polythene, Polypropylene, PVC. 
Thermosetting polymers : Thermosetting polymers are the ones on which heating change irreversibly into hard, rigid and infusible materials are called thermosetting polymers. 
e.g., Phenol-formaldehyde (bakelite) resins, melamine formaldehyde resins. 

Question. What is biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.
Answer. Biodegradable polymers : Biodegradable polymers are polymers which contain functional groups similar to the functional groups present in biopolymers but are degradable and does not pose hazard to atmosphere e.g., (PHBV). 
Poly β-hydroxybutyrate-co-β-hydroxy Valerate
(PHBV) : It is obtained by the copolymerization of 3-hydroxy butanoic acid and 3-hydroxypentanoic acid. 

Question. Write the names of monomers used for getting following polymers : 
(i) Bakelite, (ii) Neoprene.
Answer. (i) Phenol and Formaldehyde. 
(ii) 2–Chloro–1, 3–butadiene (or Chloroprene) 

Question. Write the name of monomers used for getting the following polymers :
(i) Terylene
(ii) Nylon 6, 6 
Answer. (i) Ethylene glycol (Ethane–1, 2–diol) and terephthalic acid (Benzene–1, 4–dicarboxylic acid)
(ii) Hexamethylenediamine and adipic acid. 

Question. Write the name of monomers used for getting the following polymers :
(i) Teflon (ii) Buna-S 
Answer. (i) Tetrafluoroethene 
(ii) 1, 3–Butadiene and styrene. 

Question. Draw the structure of the monomer for each of the following polymers :
(i) Nylon-6
(ii) Polypropene
Answer. (i) Nylon-6 : The monomer unit of nylon-6 is caprolactam, a cyclic amide.

(ii) Polypropene : The monomer unit of polypropene is propene.

Question. A natural linear polymer of 2-methyl-1, 3-butadiene becomes hard on treatment with sulphur between 373 K and 415 K and —S—S— bonds are formed between chains. Write the structure of the product of this treatment?
Answer. Vulcanised rubber is the product of this treatment.
It can be represented through the following reaction shown as structure :

Question. (i) To have practical applications, why are cross links required in rubber?
(ii) Why does cis-polyisoprene possess elastic property?
Answer. (i) Cross links bind the planar polymer sheets thus increasing its elastomeric properties which helps the polymer to retract to its original position after the force is released. This makes the rubber hard, tough and highly elastic with greater tensile strength. 
(ii) Cis-polyisoprene molecule consists of multiple chains held together by van der Waals interactions and has a coiled structure. Thus, it can be stretched like a spring and shows elastic properties.

Long Answer Type Questions-I 

Question. Explain the term ‘copolymerization’ and give two examples of copolymerization.
Answer. Copolymerisation is a polymerisation reaction in which a mixture of more than one monomeric species is allowed to polymerise and form a copolymer.

Question. Write the names and structures of the monomers of the following polymers :
(i) Buna-S
(ii) Neoprene
(iii) Teflon. 
Answer. (i) CH₂ = CH – CH = CH₂ and C₆H₅CH = CH₂
1, 3-Butadiene Styrene

Chloroprene/2-Chloro-1, 3-butadiene 
(iii) CF₂ = CF₂
Tetrafluoroethene 

Question. Write the names and structures of the monomers of the following polymers :
(i) Nylon-6, 6
(ii) PHBV
(iii) Neoprene
Answer.

Question. Write the names and structures of the monomers of the following polymers :
(i) Terylene
(ii) Buna-S
(iii) Neoprene
Answer. (i) Ethylene glycol HO-CH₂-CH₂-OH

(iii) Chloroprene CH₂ = C(Cl)-CH=CH₂
(Note : Half mark for name/s and half mark for structure/s in each case)

Question. Write the names and structures of the monomers of the following polymers :
(i) Polystyrene, (ii) Dacron, (iii) Teflon.
Answer. (i) Polystyrene : Monomer : Styrene (vinyl benzene)

(iii) Teflon : Monomer : Tetrafluoro ethene
CF₂ = CF₂ 

Question. Write the names and structures of the monomers of the following polymers :
(i) Bakelite (ii) Nylon-6 (iii) Polythene
Answer.

(iii) CH₂= CH₂ (Ethene)

Question. Write the structure of the monomers used for getting the following polymers :
(i) Dacron
(ii) Melamine – formaldehyde polymer
(iii) Buna-N 
Answer.

Question. Write the structures of the monomer used for getting the following polymers :
(i) Polyvinyl chloride (PVC)
(ii) Melamine-formaldehyde polymer
(iii) Buna-N 
Answer. (i) Monomer of PVC is vinyl chloride
CH₂ = CH — CI
(b) Monomer of melamine formaldehyde polymer are melamine and formaldehyde

(iii) The monomers of Buna-N are buta-1, 3 — diene and acrylonitrile
CH₂ = CH – CH = CH₂    CH₂ = CH – C º N
buta – 1, 3–diene                acrylonitrile

Question. Write the structures of the monomer used for getting the following polymers :
(i) Teflon
(ii) Melamine-formaldehyde polymer
(iii) Neoprene 
Answer. (i) CF₂=CF₂

Question. Write the names and structure of the monomer of the following polymer :
(i) Terylene
(ii) Teflon
(iii) Nylon-6,6 
Answer. (i) Ethylene Glycol and Terephthalic acid 
HOH₂C–CH₂OH, p-HOOC–C₆H₄–COOH
(ii) Tetrafluroethene, CF₂=CF₂ 
(iii) Hexamethylenediamine and adipic acid
H₂N(CH₂)₆NH₂, HOOC(CH₂)₄COOH

Question. Write the names and structure of the monomer of the following polymer :
(i) Bakelite
(ii) PVC
(iii) Buna-S 
Answer. (i) Phenol & Formaldehyde

(ii) Vinyl Chloride, CH₂=CHCl 
(iii) 1,3-Butadiene & styrene

Question. Write the names and structure of the monomer of the following polymer :
(i) Neoprene
(ii) Buna-N
(iii) PHBV
Answer. (i) Chloroprene, CH₂=C(Cl)—CH=CH₂ 
(ii) 1,3-Butadiene & Acrylonitrite 
CH₂=CH—CH=CH₂ & CH₂ = CHCN
(iii) 3-Hydroxybutanoic acid and 3-Hydroxypentanoic acid CH₃CH(OH)CH₂COOH & CH₃CH₂CH(OH) CH₂COOH 

Question. Give the formula of monomers involved in the formation of the following polymers :
(i) Buna-N
(ii) Nylon-6
(iii) Dacron 
Answer.

Question. Name the type of reaction involved in the formation of the following polymer from their respective monomers
(i) PVC.
(ii) Nylon6.
(iii) PHBV. 
Answer. (i) Addition 
(ii) Condensation / Hydrolysis 
(iii) Condensation

Question. (i) What is the role of t-butyl peroxide in the polymerization of ethene ?
(ii) Identify the monomers in the following polymer :
[ NH − (CH₂)₆ − NH − CO − (CH₂)₄ − CO ] n
(iii) Arrange the following polymers in the increasing order of their intermolecular forces :
Polystyrene, Terylene, Buna-S
Answer. (i) Radical initiator of chain reaction or as a catalyst 
(ii) NH₂ – (CH₂)₆ – NH₂ and HOOC – (CH₂)₄ – COOH
Hexamethylenediamine       Adipic acid 
(iii) Buna-S < Polystyrene < Terylene

Question. (i) What is the role of Sulphur in the vulcanization of rubber ?
(ii) Identify the monomers in the following polymer :

(iii) Arrange the following polymers in the increasing order of their intermolecular forces :
Terylene, Polythene, Neoprene.
Answer. (i) The physical properties of rubber can be altered to suit the requirements by adding sulphur in vulcanization of rubber. The process of introducing —S—S— polysulphide crosslinks between the adjacent chains tend to limit the motion of chains relative to each other.

(iii) Neoprene < Polythene < Terylene