Nitrogen gas (n2) and hydrogen gas (h2) combine to form ammonia (nh3). which equation correctly represents this reaction?
a.
n + h → nh
b.
2n2+ h2 → 3nh3
c.
2nh → n + 3h2
d.
n2+ 3h2 → 2nh3

N2+ 3H2 → 2NH3

It is the haber's process of preparation of ammonia so, option D is your answer.

Hope this helps!

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.