Polymer

Class 12th Chemistry – 15 Polymers MCQs

Condensation polymerisation is characterized by ____.

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Condensation polymerisation is the addition of monomers with elimination of small molecules like water, alcohol, etc. Simple addition of monomers will lead to addition polymerisation. Addition of unequal proportion of monomers leads to co-polymerisation.

ethylene glycol and adipic acid

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Ethylene glycol and adipic acid are the monomers of terylene polymer. Hexamethylenediamine and adipic acid will give nylon 6:6.

The radical formed in the chain propagating step to prepare polythene is ____ .

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The radical formed in the chain propagating step to prepare polythene is C6H5(CH2-CH2)n-CH2.CH2. The phenylethyl radical formed in the initiation step reacts with a molecule of ethene to form a larger radical. The repetition of this radical with new and bigger radicals forms C6H5(CH2-CH2)n-CH2.CH2.

____ is a man-made polymer.

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Polythene is a man-made polymer. Rubber and Resins are natural polymers, while Rayon is semi-synthetic polymer.

The process of formation of polymers from the respective ____ is called polymerisation.

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The process of formation of polymers from the respective monomer is called polymerisation. Dimer, trimer and tetramer are the number of structural units present in the polymer.

The example of a co-polymer is ____.

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Buna-S is an example of a co-polymer which is prepared from unequal proportion of monomers. Nylon 6, Nylon 6:6 are examples of condensation polymers. Teflon is an example of addition polymer.

Co-polymerisation involves ____.

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In co-polymerization, more than one monomers are involved in unequal proportion.

The number in polyamides (e.g. nylon 6:6) indicates ____.

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The number of carbon atoms in each monomer is indicated by numerical numbers, for example in nylon 6:6, each monomer (Hexamethylenediamine and adipic acid) contains 6 carbon atoms.

The polymer which does not belong to synthetic rubber is ____.

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The polymer which does not belong to synthetic rubber is nylon-6. Nylon-6 is the synthetic polyamide. All others are synthetic rubbers.

The monomers used in addition polymers are ____.

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The monomers used in addition polymers are unsaturated compounds e.g., alkenes, alkadienes and their derivatives. Unsaturated compounds are compounds with double bonds. All other options are compounds without double or triple bonds.

Polyamides (nylons) are generally prepared from the monomers of ____.

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Diamines and dicarboxylic acid are the monomers of polyamides.

The addition polymers formed by the repeated addition of ethene is ____.

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The addition polymers formed by the repeated addition of ethane is polythene. Propene is a monomer, which on repeated addition forms polypropene. Polystyrene is a homopolymer formed from the monomer styrene.

The common monomer involved in the preparation of, both, Buna-S and Buna-N is ____.

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1,3-Butadiene is the common monomer which is used in the preparation of Buna-S and Buna-N. Styrene is the other monomer of Buna-S and acrylonitrile is the other monomer of Buna-N. Ethylene is the monomer of polythene.

Terylene (Dacron) is also known as ____.

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Polyethylene terephthalate (PET) is the chemical name of terylene or dacron.

Polystyrene is used to manufacture ____.

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Polystyrene polymer is used to manufacture television cabinets. Paints are prepared from glyptal. Pipes and handbags are prepared from polyvinyl chloride.

In any polymer, ‘n’ refers to ____.

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In any polymer, ‘n’ refers to the degree of polymerisation which means the number of repeating monomer units in the polymer.

Neoprene is prepared by ____.

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Neoprene is prepared by addition polymerisation.

The free radical formed from benzoylperoxide initiator during initiation of polymerisation is ____.

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The free radical formed from benzoylperoxide initiator during initiation of polymerisation is 2C6H5. Benzoylperoxide dissociates to form phenyl radical through benzoyl radical as the intermediate for the initiation of polymerisation.

number of monomer units

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Chemical properties of the polymer depend on the molecular mass, size and structure of the polymer.

Low density polythene is chemically ____ and ____ but flexible and a ____ conductor of electricity.

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LDP is chemically inert and tough but flexible and a poor conductor of electricity. Hence, it is used in the insulation of electricity carrying wires and manufacture of squeeze bottles, toys and flexible pipes.

Thermoplastic polymers are capable of ____ on heating and ____ on cooling, repeatedly.

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Thermoplastic polymers are capable of softening on heating and hardening on cooling, repeatedly. These polymers possess intermolecular forces of attraction that are intermediate between elastomers and fibers. Some common thermoplastics are polythene, polystyrene, polyvinyls, etc.

Synthetic rubbers are generally prepared by the ____ method.

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Emulsion polymerisation is the method by which synthetic rubbers are prepared. The monomers are taken in emulsion form.

One of the monomers of Bakelite is ____.

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Bakelite is prepared from the monomers of phenol and formaldehyde and out of these monomers, one of the monomer is formaldehyde.

Teflon is manufactured by heating ____ with a free radical or ____ catalyst at high pressures.

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Teflon is manufactured by heating tetrafluoroethene with a free radical or persulphate catalyst at high pressures. Tetrachloroethene and tetrabromoethene are halogen derivatives and peroxide catalyst are used in free radical mechanism.

The percentage composition of natural rubber in rubber latex is ____.

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30-40% of natural rubber is present in the rubber latex which is extracted from bark of rubber tree.

____polymer is used in the manufacture of lacquers.

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Glyptal is used in the manufacture of lacquers. Buna-S is used in the manufacture of autotyres, cable insulation, etc. Polyvinyl chloride is used in the manufacture of water pipes, hand bags, rain coats etc., Polystyrene is used for making toys, radio and television cabinets.

____polymer is used exclusively to prepare fibers.

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Polypropene is exclusively used to prepare fibers. Polystyrene is used to make radio and television cabinets. Glyptal is used in the manufacture of paints and lacquers.

Molecular mass of the polymer (Mp) is equal to ____ .

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Molecular mass of the polymer (Mp) is equal to the multiplication of molecular mass of the monomer (Mm) and degree of polymerization (n).

The monomer of natural rubber is ____.

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Isoprene is the monomer of natural rubber (rubber latex) which is obtained from bark of rubber tree. Butadiene is the monomer of Buna-S, propene is the monomer of polypropene and vinyl chloride is the monomer of polyvinyl chloride.

The initiator used for obtaining high density polythene is ____.

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The initiator used for obtaining high density polythene is Zeigler-Natta catalyst. Ziegler-Natta catalyst is a combination of triethylaluminium and titanium tetrachloride. This is used to form high density polythene when polymerisation of ethene takes place at a temperature of 333 K to 343 K and under a pressure of 6 -7 atmospheres.

Class 12th Chemistry - 15 Polymers MCQs
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Class 12th Chemistry - 15 Polymers MCQs