Title Integrated Series 8th Class Chemistry- Solutions.pdf ✅

Class 8 – Chemistry | I – 8 Synthetic Fibers and Plastics 2 amounts of water. This property makes cotton an excellent choice for towels, clothing worn in hot and humid climates, and other absorbent products. 8. Correct option: (A) Among the given options nylon is the strongest fiber. It is a synthetic polymer that exhibits high strength and toughness. It has excellent tensile strength, means it can resist a considerable amount of pulling force without breaking. Due to its strength and durability, nylon is widely used in applications where toughness is essential, such as in ropes, fishing nets, parachutes, and various industrial materials. 9. Correct option: (B) The full form of PET is Polyethylene terephthalate. It is a type of polyester and widely used in the production of various products, including clothing, bottles, containers, and packaging materials, due to its strength and recyclability. 10. Correct option: (A) Terylene is a type of polyester. It is a synthetic polymer made from ethylene glycol and terephthalic acid. Terylene is a brand name for polyester that was used in the past, but the term "polyester" is more commonly used to refer to this type of synthetic fiber today. Polyester fibers, including Terylene, are known for their strength, durability, and wrinkle-resistant properties. 11. Correct option: (B) The plastic that resists the flame is Teflon. Teflon is a brand name for a type of polymer called polytetrafluoroethylene (PTFE). It is well-known for its exceptional heat resistance and non-stick properties. When exposed to flames or high temperatures, Teflon does not readily catch fire or support combustion, making it a flame-resistant material. Due to this property, Teflon is commonly used in cookware, electrical insulation, and various industrial applications where heat resistance is essential. 12. Correct option: (A) Among the given options paper is a highly degradable material. It is made from wood pulp, and it is organic nature allows it to decompose relatively quickly. Cotton cloth and wood are also biodegradable materials, but they take longer to break down compared to paper. Woolen clothes are generally less degradable as wool is a protein- based fiber and takes more time to biodegrade. 13. Correct option: (C) Synthetic fibers, such as polyester and nylon, are generally cheaper to produce than natural fibers and known for their durability and strength. However, one of the major drawbacks of synthetic fibers is that they are non-biodegradable, meaning they do not break down easily in the environment, leading to long-term pollution. All of the other are advantages of synthetic fibers. 14. Correct option: (B) Teflon is the polymer that is commonly used as a non-stick coating on utensils. It is a brand name for polytetrafluoroethylene (PTFE), which is a synthetic fluoropolymer of tetrafluoroethylene. Teflon's non-stick properties make it popular for coating cookware and other kitchen utensils, as it prevents food from sticking to the surface, making cooking and cleaning easier.