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--
Write any two physical properties of alkalis.
Any two physical properties of alkalis are:
i. They are soapy in touch and bitter in taste.
ii. Strong base or alkalis burn our skin.