Polymers

Polymers Chemistry NCERT Exemplar Solutions Class 12th Chapter Fifteen

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Buna – N is synthetic rubber which can be stretched and retains its original status on releasing the force.

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Vulcanization of rubber is carried out by heating a mixture of

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Polymers Chemistry NCERT Exemplar Solutions Class 12th Chapter Fifteen

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Vulcanization of rubber is carried out by heating a mixture of isoprene and sulphur.

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Which one of the following is NOT a copolymer?

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Polymers Chemistry NCERT Exemplar Solutions Class 12th Chapter Fifteen

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Copolymer is the polymer formed by two or more monomers having multiple bonds.

Buna – S, PHBV and butadiene – styrene are copolymers. Neoprene is homopolymer.

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In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) (number of peptide bonds) is_______________.

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Vishal Baghel

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No. of Amino acid units are 4 and

No. of peptide bonds are 3

In tetrapeptide

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Which is true about Buna-N

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Buna-N is obtained by copolymerization of 1, 3-butadiene and acrylonitrile,

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Polymers NCERT Solutions

15.22 Identify the monomer in the following polymeric structures.

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15.22 Kindly consider the following

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Polymers NCERT Solutions

15.21 Write the names and structures of the monomers of the following polymers: (i) Buna-S (ii) Buna-N (iii) Dacron (iv) Neoprene

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15.17 Kindly consider the following

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Assertion : Polytetrafluoroethene is used in making non-stick cookwares.

Reason : Fluorine has highest electronegativity.

(i) Assertion and reason both are correct statement but reason does not explain assertion.

(ii) Assertion and reason both are correct statements and reason explains the assertion.

(iii) Both assertion and reason are wrong statement.

(iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.

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This is a assertion and reason answer type question as classified in NCERT Exemplar

(iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.

Explanation: Most of the Synthetic polymers are not biodegradable. A large number of the polymers are resistant to the degradation process of the environment and therefore, are responsible for the accumlation of polymeric solid waste material.

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Assertion : Network polymers are thermosetting.

Reason : Network polymers have high molecular mass.

(i) Assertion and reason both are correct statement but reason does not explain assertion.

(ii) Assertion and reason both are correct statements and reason explains the assertion.

(iii) Both assertion and reason are wrong statement.

(iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.

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This is a assertion and reason answer type question as classified in NCERT Exemplar

(i) Assertion and reason both are correct statements but reason does not explain assertion.

Explanation: Thermosetting polymers are cross linked polymers. They are highly branched polymers with high molecular masses. These polymers on heating undergo cross linking in moulds. They become infusible on heating.

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Assertion : For making rubber synthetically, isoprene molecules are polymerised.

Reason : Neoprene (a polymer of chloroprene) is a synthetic rubber.

(i) Assertion and reason both are correct statement but reason does not explain assertion.

(ii) Assertion and reason both are correct statements and reason explains the assertion.

(iii) Both assertion and reason are wrong statement.

(iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.

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