Which of the following salts is slightly soluble in water?

A. AgCl
B. CaSO4
C. Na2CO3
D. PbCl2

Correct Answer:

Option B – CaSO4

Explanation

All sulfates are soluble except those of barium, strontium and lead. Calcium sulfate, silver sulfate and mercurous sulfate are slightly soluble in water, but calcium sulfate is rarely precipitated in reactions between the calcium and sulfate ions.