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

Published on: 13/05/2022

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Std: 12th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 3

5 x 3 = 15

Give examples for
(i) addition polymer,
(ii) Synthetic rubbers,
(iii) Condensation polymers,
(iv) formaldehyde resins.

How is Buna - N prepared? Give its use.

Give the condensation reaction between urea and formaldehyde. Identify the polymer.

The monomer is capro lactam Identify the polymer when the monomer is heated at 533K.

How is Low density polyethene prepared?

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Answers Key:

Generic 3

5 x 3 = 15

(i) Addition polymer: Polyethene, Polystyrene
(ii) Synthetic rubbers: Butyl rubbers, Buna rubbers
(iii) Condensation polymers: Terylene, glyptal, Nylon 6 6.
(iv) formaldehyde resins: Bakelite, Navolave

It is a co-polymer of acrylonitrile and buta-1,3-diene.

It is used in the manufacture of hoses and tank linings.

It is formed by the condensation polymerisation of the monomers urea and formaldehyde.

Capro lactam (monomer) on heating at 533K in an inert atmosphere with traces of water gives \(\in \) amino carproic acid which polymerises to give nylon - 6

LDPE is formed by heating ethene at 200° to 300°C under oxygen as a catalyst. The reaction follows free radical mechanism. The peroxides formed from oxygen acts as a free radical initiator.