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CBSE 12th Standard Chemistry Subject Polymers Ncert Exemplar 2 Mark Questions 2021

Published on: 25/05/2021

QB365 Provides the updated NCERT Exemplar Questions for Class 12, and also provide the detail solution for each and every NCERT Exemplar questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

Generic 2

5 x 2 = 10

can enzyme be called a polymer?

Why are rubbers called a elastomer?

Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following: (A)_m + (A)_m(A)_n or (A A)_m+n

A natural linear polymer of 2-methyl-1,3-butadiene becomes hard on treatment with sulphur between 373 to 415K and -S-S- bonds are formed between chains.Write the structure of the product of this treatment?

What is the role of benzoyl peroxide in addition polymerisation of alkenes ?

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Answers Key:

Generic 2

5 x 2 = 10

Enzymes are biocatalysts which being proteins are n regarded as polymers

Rubbers get stretched on application of force and regain original state after the force is withdrawn. Therefore, these are called elastomers.

The natural linear polymer of 2-methyl-l, 3-butadiene is cis-polyisoprene (natural. rubber). On heating with sulphur between 373·415 K, vulcanization occurs as a result of which --S--S- bridges or cross-links are introduced between polymer chains through their reactive allylic positions as shown below: