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