Question

Nitrification process ceases at pH

(a) < 5

(b) < 6

(c) < 4

(d) < 7


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Answer 1

Answer:

The answer is b.<6

Explanation:

Nitrite, the substrate of NOB, undergoes protonation to nitric acid, which disproportionates to nitrate and gaseous nitric oxide at low pHs (6). Furthermore, when present at elevated concentrations under low pHs, free nitric acid negatively affects the growth and activity of nitrifying bacteria (4).

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Answer 2

Explanation:

c is the correct answer

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