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which equations shows the complete dissociation of a strong base?

HCl -> cl- + H+

HNO2 -> H+ + NO2-

HA + h20 -> A- + H+ + h20

BOH + h20 -> B+ + OH- + H20

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The correct answer is the fourth option. The complete dissociation of a strong base is BOH + h20 -> B+ + OH- + H20 since this is the only base from the choices given. A base is a substance that accepts hydrogen ions. 

Answer : The correct option is, (4) [tex]BOH+H_20\rightarrow B^++OH^-+H_20[/tex]

Explanation :

Strong acid : Strong acids are those acids which are completely dissociates into ions in water. It dissociates into hydrogen ion and an anion.

Strong base : Strong base are those base which are completely dissociates into ions in water. It dissociates into hydroxide ion and a cation.

In all the given options, option (4) [tex]BOH+H_20\rightarrow B^++OH^-+H_20[/tex] equation shows the complete dissociation of a strong base.

While the other options shows the complete dissociation of an acid.

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