Reactions carried out by N₂ fixing microbes include

(i) $2{\mathrm{NH}}_3$ $+$ $3{\mathrm{O}}_2$ $\to$ $2{\mathrm{NO}}_2^{-}$ $+$ $2{\mathrm{H}}^{+}$ $+$ $2{\mathrm{H}}_2\mathrm{O}$

(ii) $2{\mathrm{NO}}_2$ $+$ ${\mathrm{O}}_2$ $\to$ $2{\mathrm{NO}}_3$

Which of the following statements about these equations is not true?

With regard to the biological nitrogen fixation by Rhizobium in association with soyabean, which one of the following statement/ statements does not hold true.