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NCERT Exemplar · Class 12 · Chemistry

Chapter 15: Polymers

Practice each question, then open the answer or worked solution.

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Short Answer Questions

33 questions
Q50Written answer

Assertion : For making rubber synthetically, isoprene molecules are polymerised. Reason : Neoprene (a polymer of chloroprene) is a synthetic rubber.

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Worked solution

Ans: (v) Assertion is wrong statement and reason is correct statement.

Explanation: Synthetic rubber is a type of rubber polymer that are capable of getting stretched to twice of its length. They are homopolymers of either 1,3-butadiene derivatives or copolymers of butadiene. Polychloroprene or neoprene is a type of synthetic rubber.


Q51Written answer

Assertion : Network polymers are thermosetting. Reason : Network polymers have high molecular mass.

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Ans: (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.


Q52Written answer

Assertion : Polytetrafluoroethene is used in making non-stick cookwares. Reason : Fluorine has highest electronegativity.

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Worked solution

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

Explanation: Tetrafluoroethene on heating with a free radical at high pressure forms teflon. It s chemically inert and resistant. It is used in making oil seals and gaskets ussed for non stick surfaces.