(a(i))[1]
State one further source of oxides of nitrogen in the air.
(a(ii))[1]
State one harmful effect of oxides of nitrogen on health.
(a(iii))[1]
What does the term catalyst mean?
(a(iv))[1]
Which one of the pH values could match the pH of nitric acid? Circle the correct answer. pH 1, pH 7, pH 10, pH 14
(b)[1]
Why are fertilisers added to soil in which crops are grown?
(c)[2]
Use the information in the table to arrange the four metals in order of reactivity. Put the least reactive metal first.
(d)[1]
What physical state is calcium in at $1600^\circ\text{C}$?