WAEC Chemistry 2010 Paper

Concept:Most chloride salts are soluble in water, but silver chloride is a well-known exception.Explanation:Silver chloride, $\mathrm{AgCl}$, is insoluble in water because its crystal lattice is very strong.Alkali metal and ammonium chlorides, such as $\mathrm{KCl}$ and $\mathrm{NH}_4\mathrm{Cl}$, dissolve readily in water.Zinc chloride, $\mathrm{ZnCl}_2$, is also soluble in water.Therefore, the only insoluble chloride among the given options is $\mathrm{AgCl}$.Answer:A. $\mathrm{AgCl}$