Question

Which one depicts nitrogen fixation?

• A. N${}_2$ + 3H${}_2$ = 2NH${}_3$
• B. 2NH${}_3$ = N${}_2$ + 3H${}_2$
• C. 2N${}_2$ + Glucose = 2 amino acids
• D. 2NH${}_4^{+}$ + 20${}_2$ > 8e${}^{-}$ = N${}_2$ + 4H${}_2$0

Answer 1

The correct option is A N${}_2$ + 3H${}_2$ = 2NH${}_3$

Reduction if nitrogen to ammonia by a living organism is called biological nitrogen fixation. Fixation of nitrogen,i.e, its reduction to NH3 is accomplished in three steps. In each step, two electrons(also 2 protons) are transferred from the reduced coenzyme NADPH to nitrogen. Di-amide and hydrazine are formed as intermediates. ATP, which comes through respiration provides energy. At each step, 2 electrons and 2 protons are transferred to a nitrogen through the component of nitrogenase complex. In this way, only first option is converting into ammonia while others are not.

So the correct option is "N2+3H2> 2NH3".