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--
Define alkalis with three examples.
The base that dissolve in water and produce hydroxyl (Oh-) ions are called alkalis.
For example: NaOH, KOH, etc.