(a)[1]
State one industrial use of water.
(b)[1]
What is the pH of pure water? Circle the correct option: pH 0, pH 6, pH 7, pH 14.
(c)[2]
Filtration and chlorination are two stages in water treatment. Describe the purpose of each step.
(d)[2]
Give the names of the state changes shown by A and B.
(e)[2]
Put the four metals in reactivity order, starting with the least reactive metal.