Which process is used to obtain metal from metal oxide?

Give reasons for the following:
$(i)$ Ionic compounds have high melting and boiling points.
$(ii)$ Ionic compounds are soluble in water.
$(iii)$ Ionic compounds are solid and somewhat hard.
$(iv)$ Ionic compounds conduct electricity in the molten state.
$(v)$ Metals have a tendency to lose electrons.

What is the basic raw material used in the Contact Process for the production of sulfuric acid?

Which substance is formed when ammonia gas reacts with hydrogen chloride gas?

Which of the following is a reducing agent?

During the electrolytic refining of zinc,it gets :