Question

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Answer 1

1.ANS: Aluminum foils are used to wrap because aluminum being a soft malleable metal it can be beaten to in sheets to form thin wrapping sheets.

2. ANS : Plastic containers are favoured for storing food because plastic is non-reactive and will not react with the ingredients of the food items.

3.ANS : Following precautions must be taken while taking antibiotics: Antibiotics should be taken only on the advice of a qualified doctor.

4. ANS : Metals displace hydrogen from diluted acids. Non-metals do not react with dilute acids.

5.ANS : Thermoplastic have secondary bonds between molecular chains.

Thermosetting plastics have primary bonds between molecular chains and held together by strong cross-links.