Name with examples three common forms in which metals occur in nature? How do metals interact with dilute acids? [5 MARKS]
(a) Name two metal s which occur in nature in free state as well as in combined state (b) Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula. (c) 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.
Name the different categories of microbes naturally occurring in sewage water. Explain their role in sewage water treatment.