What is acids? Give any two examples.
Acids are those chemical substances that gives hydrogen ions when dissolved in water.
For example: HCl -----> H+ + Cl-
H2SO4 -----> 2H+ + SO4--
What are base? Give any two examples.
Metallic oxides or hydroxides are called base. In broader sense, base are oxide of metals or hydrogen that are basic in nature.
For eg. PbO, CuO, etc.