(a) Name two metals which are found in nature mainly in the free state (as metallic elements). (b) Name two metals which are always found in the combined state. (c) What iron compound is present in haematite ore? Also, write its chemical formula.
In nature, metal A is found in a free state while metal B is found in the form of its compounds, Which of these two will be nearer to the top of the activity series of metals?