CBSE Class 12 Chemistry Polymers Notes Set B

QUESTIONS AND ANSWERS OF POLYMERS:

VERY SHORT ANSWERS

Q1.WHAT DOES 6, 6 INDICATE IN THE NAME OF NYLON‐ 6,6?

A1.THE TWO MONOMERS (ADIPIC ACID AND HEXAMETHYLENEDIAMINE) CONTAIN 6 CARBON ATOMS EACH.

Q2.WRITE THE MONOMER UNITS OF BAKELITE?

A2.PHENOL AND FORMALDEHYDE.

Q3.WHICH OF THE FOLLOWING ARE ADDITION POLYMERS:TERYLENE,NYLON 66,NEOPRENE,TEFLON

A3.NEOPRENE AND TEFLON ARE ADDITION POLYMERS.

Q4.TO HAVE PRACTICAL APPLICATIONS ,WHY ARE CROSS LINKES ARE REQUIRED IN RUBBER?

A4.CROSS LINKS BIND THE PLANAR POLYMER SHEETS THUS INCREASING ITS ELASTOMERIC PROPERTIES.

Q5.WRITE THE NAME OF MONOMERS OF THE FOLLOWING POLYMER:

[‐C=O‐(CH₂)₅‐NH‐]

A5. CAPROLACTUM.

SHORT ANSWER AND QUESTIONS.

Q6.WHAT IS A BIODEGRABLE POLYMER?GIVE AN EXAMPLE OF BIODEGRABLE ALIPHATIC POLYMER.

A1.POLYMERS WHICH DISINTEGRATE BY THEMSELVES OVER A PERIOD OF TIME DUE TO ENVIORNMENTAL DEGRADATION BY MICROORGANISMSARE CALED BIODEGRABLE POLYMERS.EXAMPLE –PHBV.

Q7.WRITE THE NAMES AND STRUCTURES OF THE FOLLOWINGPOLYMERS:

a)POLYSTYRENE b)DACRON c)TEFLON

A7. POLYMER MONOMERS AND THEIR STRUCTURES

 STYRENE

b)DACRON OHCH2‐CH2OH (ETHYL GLYCOL) AND TERPTHALIC ACID

C)TEFLON

2FC=CF2

Q8.LOW DENSITY POLYETHENE AND HIGH DENSITY POLYETHENE,BOTH ARE POLYMERS OF ETHENE BUT THERE IS MARKED DIFFERENCE IN THEIR PROPERTIES?

A8.BOTH OF THEM ARE DIFFER IN THEIR STRUCTURAL FEATURES.LOW DENSITY POLYETHENES ARE HIGHLY BRANCHED WHILE HIGH DENSITY POLYETHENES CONSIST OF CLOSELY PACKED LINEAR MOLECULES.CLOSE PACKING INCREASES THE DENSITY.

Q9.GIVE ONE EXAMPLE EACH OF THE FOLLOWING POLYMERS:

a)ADDITION POLYMERS

ANS.POLYTHENE

b)CONDENSATION POLYMERS

ANS.NYLON 6 ,NYLON 66

c)COPOLYMERS

A9.BUNA‐S,BUNA‐N

Q10.WHAT IS THE COMMERCIAL NAME OF PMMA?WHAT IS IS USE?

A10.THE COMMERCIAL NAME OF PMMA IS POLYMETHYLACRYLATE IS PERSPEX.IT IS USED AS ASUBSTITUTE OF GLASS.IT IS USED FOR MAKING LENSES,TRANSPARENT DOMES,AIRCRAFT WINDOWS AND SKYLIGHTS.

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