Which of the following metals exists in nature in liquid state?

Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of:

Which of the following is not a metalloid?

Write the electron dot structures of magnesium and chlorine and show the formation of magnesium chloride by the transfer of electrons.

Explain the following statements:
$(a)$ Most metal oxides are insoluble in water but some of these dissolve in water. What are these oxides and their solutions in water called?
$(b)$ At ordinary temperature,the surfaces of metals such as magnesium,aluminium,and zinc are covered with a thin layer. What is the composition of this layer? State its importance.
$(c)$ Some alkali metals can be cut with a knife.

What change occurs in the concentrated ore during the roasting process?