Explain why the following are made of thermosetting plastics.
Electric plugs/switches/plug boards

Explain why the following are made of thermosetting plastics. Saucepan Handles

Explain why the following system is not aromatic?

Explain why holes are made in hanging bannersand hoardings.

Give reasons for the following : (i) School bells are made up of metals. (ii) Electrical wires are made up of copper.

Explain why the following statements are not correct? i) All groups contain both metals and non metals. ii) In group 1, reactivity decreases with increase in atomic number. iii) Elements in a period become more metallic with increasing atomic number. iv) Atoms of elements in the same group have the same number of electrons.

Explain why plastic containers are favoured for storing food.

Explain the following. a] Why is tungsten used almost exclusively for filament of electric lamps? b] Why are the conductors of electric heating devices, such as bread-toasters and electric irons made of an alloy rather than a pure metal? c] Why is the series arrangement not used for domestic circuits? d] How does the resistance of a wire vary with its area of cross-section? e] Why are copper and aluminum wires usually employed for electricity transmission?