acids are sour in taste.
base are bitter on taste.
acid turns blue litmus paper red.
base turns red litmus paper blue.
Acid produces H+ ions in presense of moisture.
HCl-------->H+ + Cl-
Base produced OH-ions in presence of moisture.
NaOH---------->Na+ + OH-
Nonmetal oxides are generally acidic in nature.
Metal Oxides are generally basic in nature.