What is iron coated with a layer of zinc called?

What type of oxide is aluminium oxide $(Al_2O_3)$?

Which process is used to determine the reactivity of a metal?

What will happen when:
$(i)$ Magnesium is treated with very dilute nitric acid?
$(ii)$ Steam is passed over red hot iron?

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.

Why are sulphide and carbonate ores converted into oxides?