JAMB Chemistry 2018 Paper

Concept:A substance that is insoluble or ionizes only slightly produces relatively few ions in solution.Explanation:Sodium hydroxide ($\mathrm{NaOH}$) and potassium hydroxide ($\mathrm{KOH}$) are soluble strong bases that dissociate completely in water, releasing many ions.Calcium hydroxide ($\mathrm{Ca(OH)_2}$) is sparingly soluble, but the dissolved portion ionizes strongly.Aluminium hydroxide ($\mathrm{Al(OH)_3}$) is insoluble in water because it has a polymeric structure and high lattice energy.Water cannot easily break the strong bonds in $\mathrm{Al(OH)_3}$, so only very few ions are produced in solution.Hence, $\mathrm{Al(OH)_3}$ produces relatively few ions.Answer:D. $\mathrm{Al(OH)_3}$