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$2 {NH}_{3} + 3 O_{2} \overset{a}{\to} 2 {NO}_{2} + O_{2} \overset{b}{\to} 2 {NO}_{3}$
In the above reaction a and b are

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Thiobacillus and Nitrococcus

Nitrosomonas and Nitrobactor

Nitrococcus and Nitrosomonas

Nitrobactor and Nitrosomonas

answer is B.

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Detailed Solution

Ammonia was first oxidized to nitrite by the bacteria Nitrosomonas and/or Nitrococcus.

The nitrite is further oxidized to nitrate with the help of the bacterium Nitrobacter. These steps are called nitrification.

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