Which of the following statements are correct? (i) Buna-N being resistant to the action of petrol, lubricating oil and organic solvents is used in making oil seals. (ii) Biodegradable polymers are manufactured because of low chemical resistance, strength and durability of conventional polymers (iii) PHBV is a copolymer used in the manufacture of orthopaedic devices (iv)Nylon 2-nylon 6 is a biodegradable polymer.

Which of the following statements are correct? (i) Buna-N being resis

1.	Which of the following statements are correct? (i) Buna-N being resistant to the action of petrol, lubricating oil and organic solvents is used in making oil seals. (ii) Biodegradable polymers are manufactured because of low chemical resistance, strength and durability of conventional polymers (iii) PHBV is a copolymer used in the manufacture of orthopaedic devices (iv)Nylon 2-nylon 6 is a biodegradable polymer.
Answer» (i), (ii) and (iii) (ii), (iii) and (IV) (i), (iii) and (iv) (i) and (iv) Solution :Biodegradable polymers are manufactured because CONVENTIONAL polymers are QUITE resistant to the environmental degradation which leads to accumulation of polymeric solid waste materials CAUSING acuteenvironmental PROBLEMS.