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

Assessment: WAEC SSCE - Chemistry - 2000 (Objective) Subject: Chemistry

Question 1 Report

Which of the following compounds dissolves in water to give an alkaline solution?
Answer Details
Among the given options, only potassium oxide dissolves in water to give an alkaline solution. When potassium oxide (K2O) is dissolved in water, it reacts with water to form potassium hydroxide (KOH), which is a strong base. The chemical equation for this reaction is: K2O + H2O → 2KOH Hence, the solution formed is alkaline due to the presence of hydroxide ions (OH-) from the dissociation of the potassium hydroxide. The other compounds listed do not produce hydroxide ions when dissolved in water, and therefore do not give an alkaline solution.
Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)
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