(a) Common salt:
Normal salt is a salt formed by the complete replacement of hydrogen atoms with a metallic or ammonium ion.
Eg: Na2SO4, NaCl
(b) Acidic salts:
Acid salts are formed by the partial replacement of hydrogen ionized atoms of polybasic acid with iron or ammonium ion.
Eg: NaHSO4, Na2HPO4
(c) Mixed salt:
Mixed salt is any salt that contains more than one basic or radical acid.
Eg: NaKCO3, CaOCl2