(a)[1]
From the list, choose the word that names this reaction.
(b(i))[1]
Give the meaning of the symbol $\rightleftharpoons$ in this equation.
(b(ii))[1]
State the percentage of nitrogen present in clean, dry air.
(c)[2]
Name two additional elements in most fertilisers that are needed for plant growth.
(d(i))[1]
Name one other pollutant in the air that causes acid rain.
(d(ii))[1]
State one harmful effect of acid rain on buildings.