Which of the following compounds is the least soluble in water? By: Sunday|Published on: Dec 10|Categories: Chemistry WAEC| 0 comments A. CaCl2 B. CaSO4 C. NaCl D. Na2SO4 Correct Answer: Option B B. CaSO4 Users Also Read These:Which of the following salts is slightly soluble in water?Which of the following hydroxides is not readily…Which of the following compounds would dissolved in…Which of the following organic compounds is very…Which of the following salts is readily soluble in water? SEE ALSO Which of the following substances is mainly responsible for the depletion of the ozone layer?