Concept:Solubility rules help determine which salts dissolve only slightly in water.
Explanation:Most sulfate salts are soluble in water.
However, calcium sulfate is a known exception and is only slightly soluble.
Silver chloride is practically insoluble, not just slightly soluble.
Sodium carbonate dissolves readily in water.
Lead chloride is sparingly soluble but not classified the same way as calcium sulfate in this context.
Therefore, the salt that is commonly described as slightly soluble is calcium sulfate.
Answer:B.
CaSO4