Generally,non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?

Give reasons for the following:
$(a)$ School bells are made of metals.
$(b)$ Electrical wires are made of copper.

Iqbal treated a lustrous,divalent element $M$ with sodium hydroxide. He observed the formation of bubbles in the reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.

What is the color of copper carbonate salt?

Describe ionic compounds on the basis of the following properties:
$(i)$ Strong force of attraction between positive and negative ions:
$(ii)$ Solubility of compounds in water.
$(iii)$ Electrical conductivity.

What is the chemical formula of rust?