Q50 of 57 Page 224

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

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


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


Isoprene molecule is the monomer of the natural rubber.



Thus, the assertion is wrong.


Neoprene is the synthetic rubber which is formed by the polymerization of the polymer chloroprene.



Thus, only the reason statement is correct.

More from this chapter

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48

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Olefinic monomers undergo addition polymerisation.


Reason : Polymerisation of vinylchloride is initiated by peroxides/ persulphates.


 49

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Polyamides are best used as fibres because of high tensile strength.


Reason : Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers.


51

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Network polymers are thermosetting.


Reason : Network polymers have high molecular mass.


 52

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

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


Reason : Fluorine has highest electronegativity.