Acids, Bases and Salt

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Which oxide reacts with an alkali to form a salt, but does not react with acid to form a salt?

Which of the following describes a step in the preparation of insoluble barium sulfate from aqueous barium chloride and dilute sulfuric acid?

Which element forms an oxide that reacts with water to give an acidic solution?

Copper (II) chloride crystals can be prepared by reacting dilute hydrochloric acid with several substances. Which of the following substances cannot be used?

Which compound can be prepared by reacting a metal with a dilute acid?

What is the best method of making copper (II) sulfate?

Which of the following compound dissolves in water to give an alkaline solution?

A man suffering from an excess if acid in his stomach has no indigestion tablets. Which substance could he take to lower this acidity?