94420 + Interview Questions in Chemistry in Class 12

1.	Polypropylene contains a large number of chiral carbon atoms. Would you , therefore , expect samples of either isotactic , syndiotactic or atactic polypropylene to roatate plane - polarized light ? Explain.
Answer» SOLUTION :No. Net rotation is zero SINCE equal amounts of (+) and (-) ENANTIOMERS are PRESENT.

Discussion

2.	Polypropylene can be obtained by polymerisation of
Answer» `CH-=CH` `CH_(2)=CH_(2)` `CH_(3)-CH-=CH_(2)` `CH_(3)-C-=CH` SOLUTION :`underset("PROPENE")(nCH_(3))-CH=CH_(2) to underset("Polypropylene")([-CH_(2)-underset(CH_(3))underset(\|)(CH)-]_(N))`

Discussion

3.	Polypeptides are the chains of
Answer» amino acids nitrogen ATOMS HYDROGEN atoms OXYGEN atoms Answer :A

Discussion

4.	Polynucleotides are nucleic acid. Every nucleotide is made up of three parts, i.e, a pentose sugar , a heterocyclic nitrogenous base and phosphoric acid. Depending upon the type of sugar whether, ribose or 2-deoxyribose, nucleic acid are called RNA and DNA respectively. overall there are remaining three are pyrimidines . out of these five bases, each type nucleic acid has four of them. In nucleic acids, the nucleotides are linked to one another through
Answer» HYDROGEN BOND Peptide bond GLYCOSIDIC linkage Phosphate groups Answer :D

Discussion

5.	Polynucleotides are nucleic acid. Every nucleotide is made up of three parts, i.e, a pentose sugar , a heterocyclic nitrogenous base and phosphoric acid. Depending upon the type of sugar whether, ribose or 2-deoxyribose, nucleic acid are called RNA and DNA respectively. overall there are remaining three are pyrimidines . out of these five bases, each type nucleic acid has four of them. Which base is found only in the nucleotides of RNA
Answer» ADENINE URACIL Guanine Cytosine and uracil Solution :Uracil is FOUND only in RNA but not in DNA

Discussion

6.	Polynucleotides are nucleic acid. Every nucleotide is made up of three parts, i.e, a pentose sugar , a heterocyclic nitrogenous base and phosphoric acid. Depending upon the type of sugar whether, ribose or 2-deoxyribose, nucleic acid are called RNA and DNA respectively. overall there are remaining three are pyrimidines . out of these five bases, each type nucleic acid has four of them. Which of the following sets of bases is present both in DNA and RNA
Answer» Adenine, uracil, thymine Adenine, GUANINE, CYTOSINE Adenine,guanine,uracil Adenine, guanine,thymine Solution :Adenine , guanine and cytosine are PRESENT both in DNA and RNA

Discussion

7.	Polynucleotide chain is
Answer» POLYAMIDE chain polyster chain polypeptide chain polyglycosidic chain Answer :B

Discussion

8.	Polymers of the type Z-Mn-Y , i.e those which contain a foreign molecule in addition to the recurring unit are known as
Answer» SEMISYNTHETIC POLYMERS Atactic polymers Telomers Pasticiser ANSWER :C

Discussion

9.	Polymers of more than 10000 amino acids are termed
Answer» proteins tripeptide dipeptide oligopeptide Answer :A

Discussion

10.	Polymorphism.
Answer» Solution :A PHENOMENON in which when a single SUBSTANCE crystallises in TWO or more forms under different CONDITIONS of solidification is called POLYMORPHISM and the substance is called polymorphous.

Discussion

11.	Polymersin whichthe chains areheld together by can der Waals' forces are called ?
Answer» FIBRES THERMOSETTING POLYMERS ELASTOMERS thermoplastics Answer :C

Discussion

12.	Polymers have:
Answer» ABSOLUTE mol.wt. Average mol.wt. Low mol.wt. Absolute m.pt. Answer :B

Discussion

13.	Polymers can be classified based on molecular forces Classify the following polymers into elastomers and fibres :Rubber, Nylon 6, 6, Buna-S, Terylene
Answer» SOLUTION :ELASTOMERS: RUBBER, Buna-S FIBRES :Nylon 6, 6, TERYLENE

Discussion

14.	_____polymers are resistant to environmental degradation process and do not degrade on their own but accumulate as solid waste materials.
Answer» Natural Semi-synthetic Synthetic All of these Answer :C

Discussion

15.	Polymers are high molecular mass substances consisting of large number of repeating structural units derived from simple molecules. The polymers formed from one type of monomers are called homopolymers and those formed from two or more different monomers are called copolymers. Depending upon the molecular forces between monomers, polymers may be classified as elastomers, fibers, thermoplastic and thermosetting polymers. The polymers may be formed simply by addition of monomers called addition polymers or by combination of two or more monomers by elimination of simple molecules, called condensation polymers. Name condensation polymer whose one monomer is methanal.
Answer» SOLUTION :BAKELITE

Discussion

16.	Polymers are high molecular mass substances consisting of large number of repeating structural units derived from simple molecules. The polymers formed from one type of monomers are called homopolymers and those formed from two or more different monomers are called copolymers. Depending upon the molecular forces between monomers, polymers may be classified as elastomers, fibers, thermoplastic and thermosetting polymers. The polymers may be formed simply by addition of monomers called addition polymers or by combination of two or more monomers by elimination of simple molecules, called condensation polymers. Is (--NH-underset(R)underset(\|)CH-CO--)_(n)a homopolymer or a copolymer?
Answer» SOLUTION :HOMOPOLYMER

Discussion

17.	Polymers are macro molecules formed by union of monomers. Name natural polymers and synthetic polymer
Answer» Solution :Natural polymer: CELLULOSE, SYNTHETIC polymer: TERYLENE

Discussion

18.	Polymers are macro molecules formed by union of monomers.Distinguish between thermoplastic and thermosetting polymers with example
Answer» SOLUTION :Thermoplastics are polymers which becomes soft on HEATING and hard on cooling and this PROCESS can be repeated many times e.g., PVC, polythene Thermosetting polymers become infusible and hard on heating due to the formation of cross LINKS. They cannot be remelted or remoulded e.g, bakelite.

Discussion

19.	Polymers are high molecular mass compounds having special properties so used for special purposes. Identify the following polymers X,Y and Z Y is a polymer formed from ethylene glycol and terephthalic acid and used for making heart valves
Answer» SOLUTION :TERYLENE

Discussion

20.	Polymers are high molecular mass compounds having special properties so used for special purposes. Identify the following polymers X,Y and ZZ is a polymer used for making unbreakable crockery items.
Answer» SOLUTION :Melamine-Formaldehyde POLYMER

Discussion

21.	Polymers are different types Identify the thermoplastic polymers from the following:
Answer» Bakelite Nylon-6,6 Neoprene PVC Solution :PVC

Discussion

22.	polymers are:
Answer» MICROMOLECULE Macromolecules Sub -micromolecules None of these Answer :B

Discussion

23.	Polymers are classified into elastomers, fibres, thermoplastics and thermosetting plastics, depending upon the intermolecular forces. Fill in the vacant boxes given below:
Answer» SOLUTION :Bakelite Elastomer Isoprene Fibre Nylon 6 THERMOPLASTIC POLYMER

Discussion

24.	Polymers.
Answer» Solution :Polymers are high MOLECULAR WEIGHT macromolecules and CONSIST of repeating units of monomers.

Discussion

25.	Polymerisation of glycol with dicarboxylic acid is
Answer» ADDITION POLYMERISATION Condensation polymerisation Telomerisation Any of these Solution :Condensation polymerisation because LOSS of WATER MOLECULES takes place.

Discussion

26.	Polymerization of chloroprene is catalyzed by
Answer» `N_2` CATALYST PEROXIDE catalyst `H_2`+NI catalyst Lindlar catalyst Answer :B

Discussion

27.	Polymerization of iso butene is mostly initiated by
Answer» a CATION an ANION a FREE radical Zwitter ion Answer :A

Discussion

28.	Polymerizationof iso buteneis mostly
Answer» a CATION an anion a free radical a ZWITTER ion Solution :Alkene derivativescontaining+I groups undergoes cationicpolymerisation

Discussion

29.	Polymerisation reactions follows ................order kinetics.
Answer» FRACTIONAL FIRST ZERO PSEUDO first Answer :A

Discussion

30.	Polymerisation of tetrafluoroethene gives
Answer» NEOPRENE Buna-S Buna-N Teflon ANSWER :D

Discussion

31.	Polymerisation of buta-1,3diene by free radical mechanism gives:
Answer» TRANS`-1,4-polybutadiene cis`-1,4-polybutadiene polyvinyl polyethene polyallyl polyethene Answer :A::B::C

Discussion

32.	Polymerisation of chloroethylene gives the polymer:
Answer» POLYETHENE PVC Teflon Nylons Answer :B

Discussion

33.	Polymerisation in which two or more chemically different monomers take part is called
Answer» ADDITION polymerisation COPOLYMERISATION Chain polymerisation Homopolymerisation Solution :Adipic acid +HEXAMETHYLENEDIAMINE ` to `NYLON -66

Discussion

34.	Polymer with which functional group is known as polyamide ?
Answer» `-CONH-` `-COO-` `-CH_(2)-CH_(2)-` `-CO-` SOLUTION :`-CONH-`

Discussion

35.	Polymerisation in which two or more chemically different monomers take part is called:
Answer» ADDITION polymerisation Copolymerisation Chain polymerisation Homo polymerisation Answer :B

Discussion

36.	Polymer with which functional group is known as polyester ?
Answer» `-CONH-` `-COO-` `-CF_(2)-CF_(2)-` `-CH_(2)-` SOLUTION :`-COO-`

Discussion

37.	Polymer which has amide linkage is
Answer» nylon-6,6 TERYLENE TEFLON BAKELITE ANSWER :A

Discussion

38.	Polymer used in bullet proof is or plexi glass is
Answer» Polystyrene POLY ACRYLONITRILE Poly ETHYL ACRYLATE Polymethyl methacrylate ANSWER :D

Discussion

39.	Polymer used in bullet proof glass is:
Answer» lexan PMMA nomex kevlar Solution :PMMA and polycarbonate are USED in bullet PROOF GLASS

Discussion

40.	Polymer used for making crookeries is
Answer» Teflon melamine METHANAL polymer urea FORMALDEHYDE polymer Bakelite Answer :B

Discussion

41.	Polymer used for the insulation of electrical cables is:
Answer» PVC Glyptal Neoprene All of these Answer :A

Discussion

42.	Polymer used in bullet proof glass is
Answer» PMMA Lexan Nomex Kevlar Answer :B

Discussion

43.	Polymer of cholorprene is
Answer» ISOPRENE Neoprene Both None SOLUTION :Neoprene is a POLYMER of chloroprene.

Discussion

44.	Polymer used for controlled release of drugs SI
Answer» POLY GLYCOLIC ACID Poly LACTIC acid Nylon-2-Nylon-6 PHBV Answer :D

Discussion

45.	Polymer of alpha-amino add is
Answer» ACETAMIDE ammonia protein fatty ACIDS ANSWER :C

Discussion

46.	polymer of 2-methly -1,3-butaliene (isoprene) would give which product on (reductive ) ozonolysis ?
Answer» `CH_(3)-underset(CHO)underset(\|)(CH)-OVERSET(O)overset(\|\|)C-CH_(3)` `OHC-CH_(2)-CH_(2)-overset(O)overset(\|\|)C-CH_(3)` `OHC-CH_(2)-CH_(2)-CH_(2)-CHO` `CH_(3)-underset(O)underset(\|\|)C-CH_(2)-underset(O)underset(\|\|)C-CH_(3)` SOLUTION :N//A

Discussion

47.	Polymer of chloroethylene is :
Answer» PVC Teflon Nylon Terrylene Answer :A

Discussion

48.	Polymer obtained by the condensation polymerization is
Answer» polythene teflon phenol-formaldehyde RESIN nitrile rubber. Solution :phenol-formaldehyde resin

Discussion

49.	Polymer obtained by condensation polymerization is
Answer» POLYTHENE Teflon Phenol - FORMALDEHYDE NITRILE rubber. Solution : Phenol-formaldehyde

Discussion

50.	Polymerobtained by condensation polymerisation is
Answer» polythene TEFLON PHENOL-formaldehyde NITRILE RUBBER Solution :Phenol -formaldehyde polymer is OBTAINED by condensation polymerisation.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Polypropylene contains a large number of chiral carbon atoms. Would you , therefore , expect samples of either isotactic , syndiotactic or atactic polypropylene to roatate plane - polarized light ? Explain.

Polypropylene can be obtained by polymerisation of

Polypeptides are the chains of

Polynucleotide chain is

Polymers of the type Z-Mn-Y , i.e those which contain a foreign molecule in addition to the recurring unit are known as

Polymers of more than 10000 amino acids are termed

Polymorphism.

Polymersin whichthe chains areheld together by can der Waals' forces are called ?

Polymers have:

Polymers can be classified based on molecular forces Classify the following polymers into elastomers and fibres :Rubber, Nylon 6, 6, Buna-S, Terylene

_____polymers are resistant to environmental degradation process and do not degrade on their own but accumulate as solid waste materials.

Polymers are macro molecules formed by union of monomers. Name natural polymers and synthetic polymer

Polymers are macro molecules formed by union of monomers.Distinguish between thermoplastic and thermosetting polymers with example

Polymers are high molecular mass compounds having special properties so used for special purposes. Identify the following polymers X,Y and Z Y is a polymer formed from ethylene glycol and terephthalic acid and used for making heart valves

Polymers are high molecular mass compounds having special properties so used for special purposes. Identify the following polymers X,Y and ZZ is a polymer used for making unbreakable crockery items.

Polymers are different types Identify the thermoplastic polymers from the following:

polymers are:

Polymers are classified into elastomers, fibres, thermoplastics and thermosetting plastics, depending upon the intermolecular forces. Fill in the vacant boxes given below:

Polymers.

Polymerisation of glycol with dicarboxylic acid is

Polymerization of chloroprene is catalyzed by

Polymerization of iso butene is mostly initiated by

Polymerizationof iso buteneis mostly

Polymerisation reactions follows ................order kinetics.

Polymerisation of tetrafluoroethene gives

Polymerisation of buta-1,3diene by free radical mechanism gives:

Polymerisation of chloroethylene gives the polymer:

Polymerisation in which two or more chemically different monomers take part is called

Polymer with which functional group is known as polyamide ?

Polymerisation in which two or more chemically different monomers take part is called:

Polymer with which functional group is known as polyester ?

Polymer which has amide linkage is

Polymer used in bullet proof is or plexi glass is

Polymer used in bullet proof glass is:

Polymer used for making crookeries is

Polymer used for the insulation of electrical cables is:

Polymer used in bullet proof glass is

Polymer of cholorprene is

Polymer used for controlled release of drugs SI

Polymer of alpha-amino add is

polymer of 2-methly -1,3-butaliene (isoprene) would give which product on (reductive ) ozonolysis ?

Polymer of chloroethylene is :

Polymer obtained by the condensation polymerization is

Polymer obtained by condensation polymerization is

Polymerobtained by condensation polymerisation is