Acids, bases and salts
95 past-paper questions on Acids, bases and salts · examined 2023–2025.
20258 questions
Base Q dissolves in water to make aqueous Q. Aqueous Q is tested with thymolphthalein. Which row gives the colour of thymolphthalein in aqueous Q and the ion responsible for this colour?
Solid calcium hydroxide is added to aqueous ammonium chloride and the mixture is warmed. A gas is produced. What is the name of the gas?
Which three compounds are all insoluble in water?
Which row describes the conditions used in the manufacture of sulfuric acid by the Contact process?
A farmer incorrectly adds two substances to the soil at the same time. They react together to form a gas which turns damp red litmus paper blue. What are the two substances?
Which row shows the equations for the dissociation of hydrochloric acid and of ethanoic acid in aqueous solution?
Which three oxides are all acidic?
Give the formulae of two ions from Table 3.1 which can be combined with potassium ions to make an NPK fertiliser.
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