1) what is the colour when mixing acid and alkali to make a neutral solution a) pink b) blue c) purple d) brown 2) what the sort of reaction happens when an acid and alkali are mixed? a) combustion b) neutralisation c) displacement d) dissolving 3) which of these is a physical property of iron? a) it reacts with sulfur when heated b) it has a melting point of 1538°C c) it combines with oxygen to form rust d) it has a pH of 2 4) which of the following is a chemical property of a substance? a) flammability b) boiling point c) density d) color 5) which of the following is a chemical change a) freezing b) crushing c) iron rusting d) breaking

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