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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Chemistry Test1.
Identify the monomers of the following polymers.
(ii) (NH(CH2)6 NHCO (CH2)4 CO)n
(iii) \({ CH }_{ 2 }-\underset { \overset { | }{ Cl } }{ C } =CH-{ CH }_{ 2 })_{ n }\)
2.
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.
3.
Write the preparation of neoprene and give its use.
4.
How is Nylon - 6,6 prepared? Give it use.
5.
Give the structure of melamine formaldehyde resin.
1.
2.
(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.
3.
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
4.
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 ...
5.
12th Standard Syllabus & Materials
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