Name one ore of manganese. Which compound of manganese is present in this ore ? Also write its chemical formula.

37 How is zinc extracted from its carbonate ore (calamine)? Explain with equations. 38 Name two metals which occur in nature in free state as well as in combined state. 38 A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal. 39 How does the method used for extracting a metal from its ore depend on the metal's position in the reactivity series? Explain with examples.