Question

25) Why acids are stored in plastic bottles?
26) Sita and Geeta went for shopping to buy clothes for winter. Sita wanted to buy either silk or polyester clothes while Geeta the woolen. Who is correct among them? Give reason.
27) How we can make the best use of non-biodegradable substances over biodegradable ones.
28) Reema was cooking near the store wearing a nylon sarees. DO you think it is safe for her?
29) Coal and petrol apart from using as a sources for fuel, synthetic fibres are made out of them. Justify.
30) We use PET bottles . PET jars for storing sugar, dal, salt etc. what is the PET exactly.

Answer 1

Explanation:

26.

Ans Because plastic does not react with acid but the metal react with acid.

27.

Ans Sita has to buy cotton clothes because cotton is good conductor of evaporation where as the polyester clothes are not good conductor of evaporation that's why Sita has to buy cotton clothes in summer.

28.

1. By using the different dustbins for them.
2. By recycle them.

Answer 2

Answer:

25. Acid are stored in plastic bottles because of its high reactivity toward glass and moderate reactivity toward many metals acids are stored in plastic bottles.

26. Geeta is right.

Because air is a poor conductor of heat and woolen clothes do not allow the transfer of body heat to the environment and keep us warm.

27. We can use the clean plastic for recycling into plastic granules. Plastic wastes can be shredded and the shredded plastic can be used for road tarring.

28. Nylon is highly inflammable, catches fire very quickly hence it is not safe to wear nylon while working near flame.

29. Coal and Petroleum are used for making synthetic fibers. Nylon was first commercially synthesized fiber.

30. PET bottles and PET jars are used for storing purposes because it is very familiar to Polyester . It is made of repeating units of chemicals called Easter.

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