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# In Nitrogen fixation $N_2\qquad\underrightarrow {Nitrogenase}\qquad x \rightarrow NO_2^-\qquad\underrightarrow{\text{In soil}}\qquad y.$.The x in the equation is

$\begin{array}{1 1}(a)\;NH_2\\(b)\;NH_3\\(c)\;N_2\\(d)\;NO_3\end{array}$

The x in the above equation is $NH_3$
Hence (b) is the correct answer.