Compounds which on dissolving in water gets completely dissociates into its ions are known as strong electrolytes whereas compounds which on dissolving in water gets partially dissociates into its ions are known as weak electrolytes.
Substances which gives solution on dissolving in water and do not dissociates into ions also does not conduct electric current are known as nonelectrolyte.
On adding [tex]HCl[/tex] (strong acid) in water, it will completely dissociates into ions ([tex]H^{+}[/tex] and [tex]Cl^{-}[/tex]) and thus, it is a strong electrolyte.
On adding [tex]NaOH[/tex] (strong base) in water, it will completely dissociates into ions ([tex]Na^{+}[/tex] and [tex]OH^{-}[/tex]) and thus, it is a strong electrolyte.
On adding [tex]HCOOH[/tex] (weak acid) in water, it will partially dissociates into ions ([tex]H^{+}[/tex] and [tex]HCOO^{-}[/tex]) and thus, it is a weak electrolyte.
On adding [tex]CH_3NH_2[/tex] (weak base) in water, it will partially dissociates into ions ([tex]CH_3NH_3^{+}[/tex] and [tex]OH^{-}[/tex]) and thus, it is a weak electrolyte.
On adding [tex]KCl[/tex] in water, it will completely dissociates into ions ([tex]K^{+}[/tex] and [tex]Cl^{-}[/tex]) and thus, it is a strong electrolyte.
On adding [tex]C_2H_5OH[/tex] in water, it will not dissociates into ions and thus, it is a nonelectrolyte.
On adding [tex]C_{12}H_{22}O_{11}[/tex] in water, it will not dissociates into ions and thus, it is a nonelectrolyte.