Why is it necessary to mix the solution very rapidly when the bleach is added?

It is necessary to add the bleach rapidly because the chemical reaction will occur rapidly. In order to get all of the bleach to interact with the other substance as a whole and not in part, it is necessary to add everything in a very rapid manner, otherwise the amount of the other chemical may not have enough time to properly interact with all of the bleach.

Hydrogen is the most abundant element on the periodic table..hope it .