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12th Standard English Medium Chemistry Subject Chemistry In Everyday Life Creative 3 Mark Questions with Solution Part - II

Published on: 21/06/2021

QB365 provides detailed and simple solution for every Creative Questions in class 12 Chemistry Subject. It will helps to get more idea about question pattern in
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Std: 12th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

Identify the monomers of the following polymers.

(ii) (NH(CH₂)₆ NHCO (CH₂)₄ CO)n
(iii) \({ CH }_{ 2 }-\underset { \overset { | }{ Cl } }{ C } =CH-{ CH }_{ 2 })_{ n }\)

Identify the polymer and write the reaction involved.
(i) Buta-1,3-diene and styrene in the presence of sodium.
(ii) 3 - hydroxy butanoic acid and 3-hydroxy pentanoic acid.

Write the preparation of neoprene and give its use.

How is Nylon - 6,6 prepared? Give it use.

Give the structure of melamine formaldehyde resin.

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Answers Key:

Generic 3

5 x 3 = 15

(i) It is a co-polymer It is obtained by the polymerisation of buta-Ls-diene and styrene in the ratio 3:1 in the presence of sodium.

(ii) It is the co - polymer of the monomers 3 - hydroxybutanoic acid and 3-hydroxypentanoic acid. In PHBV, the monomer units are joined by ester linkages.

The free radical polymeristion of the monomer, 2-c Woro buta -1,3-diene( chloroprene) gives neoprene.

It is superior to rubber and resistant to chemical action.
Uses: It is used in the manufacture of chemical containers, conveyer belts

Nylon - 6,6 can be prepared by mixing equimolar adipic acid and hexamethylene - diamine to form a nylon salt which on heating eliminate a water molecule to form amide bonds.

It is used in textiles, manufacture of cards etc ...