(a(i))[1]
State one source from which sulfur dioxide enters the air.
(a(ii))[1]
What does the term catalyst mean?
(a(iii))[1]
Which one of the following pH values could be the pH of acid rain? Draw a circle around the correct answer. pH 4 pH 7 pH 9 pH 13
(a(iv))[1]
State one harmful effect of acid rain on buildings.
(b)[2]
At $-20\,^{\circ}\text{C}$, what state is sulfur dioxide in? Explain your answer.
(c)[1]
State the name of the salt produced when excess sulfuric acid reacts with ammonia.
(d)[2]
Use the data in the table to arrange the four metals by reactivity. Begin with the least reactive metal.