Chemistry M.C.Q (1 Marks)

Neoprene has superior resistance to vegetable and mineral oils.
The material used in the neoprene is nothing but the rubber which has strong resistant towards vegetable and mineral oil.

Teflon and polystyrene are thermoplastics since they can be moulded again by heating and melting.

The polymer of ethylene glycol and terephthalic acid is known as terylene or dacron.

Blended fibres are made by combining various fibres to enhance the property of the product.
For eg: spandex and cotton is a natural mix for sports clothing and undergarments to improve stretching properties and prevent odour.
A blended fabric helps overcome the disadvantages of natural and synthetic fibre.

Copolymerisation is a polymerization reaction in which a mixture of more than one monomeric species is allowed to polymerize to form a copolymer.

Dacron, also known as Terylene; a polymer formed from polymerization of ethylene glycol and Terephthalic acid.

Cellulose, protein and starch are classified as natural polymers. They are obtained from either plants or animals.
They are named as plant polymers and animal polymers.
Other examples of natural polymers include jute, linen, silk and wool etc.
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Polymerisation is the joining together of two or more simple molecules called Monomers to form a new compound of the same empirical formula called a polymer which has higher molecular weight.

Neoprene polymerizes from its monomer unit chloroprene.

Nylon is the strongest man-made fiber prepared by polymerizing amide molecules.
Nylon is used in the making of different types of clothes, ropes, sleeping bags, parachutes, tents etc because the fiber of nylon is stronger than a steel wire of the same thickness.

The addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds, e.g., the formation of polythene from ethene and polypropene from propene. However, the addition polymers formed by the polymerisation of a single monomeric species are known as homopolymers.

Polymer used to make gasket of pressure cooker is teflon. Teflon is formed by free radical vinyl polymerisation of the monomer tetrafluoroethylene.

Polyamides are generally fibers because of the intermolecular forces like hydrogen bonding which gives them high tensile strength.

In vulcanization, there is formation of crosslinks of sulphur at the reactive sites of the double bond which stiffens the rubber and also increase the resistance to abrasion and tensile strength, the elasticity of the rubber.

People who weave clothes are called weavers. The person makes fabric by weaving fibre. Weaving is a method of textile production consisting of two different types of thread that are interlaced at right angles to form the cloth

Bakelite is a condensation polymer of phenol and formaldehyde.
Bakelite is widely used for making molded products.
It was the first plastic made from synthetic components.

Vulcanization is addition of sulphur in natural rubber by chemical process to improve its durability.

Plastic have low toxicity due to their insolubility in water and because they are biochemically inert due to large molecular weight. Plastic products contain a variety of additives. Plastic is light, durable and doesn't react chemically with water.

Polymers are made of repeat units derived from natural gas or coal or crude oil. But building block repeat units can sometimes be made from renewable materials such as polylactic acid from corn or cellulosics from cotton linters.
Some plastics have always been made from renewable materials such as cellulose acetate used for screwdriver handles and gift ribbon.

Mixture of styrene and methyl methacrylate can form a copolymer and not an ionic addition polymer.
Hence, the statement in option is incorrect.
Other statements are correct.

Nomex is used to manufacture clothes for firefighters . It is also used to prepare protective clothes for race car drivers. Dynel is used in the preparation of human hair wigs.
Thiokol is used in rubber. Kevlar is used to prepare bullet proof vests and helmets.