For nitrification, the optimum pH is

✅ Explanation:
-Nitrification, the process where ammonia is converted to nitrite and then nitrate, is carried out by specific bacteria like Nitrosomonas and Nitrobacter. These bacteria thrive in a slightly alkaline environment. A pH of around 8.5 is considered optimal for their activity, allowing them to function efficiently and carry out the nitrification process at the highest rate.
-Nitrosomonas: Has an optimal pH between 7.0 and 8.0
-Nitrobacter: Has an optimal pH between 7.5 and 8.0