Question

Which of the following salts is not soluble in water?

• A. $K_{2}C{O}_3$
• B. $R{b}_{2}S{O}_4$
• C. $BaC{O}_3$
• D. $NaI{O}_3$

Answer 1

Answer: (C)

$BaC{O}_3$

$BaC{O}_3$ is not soluble in water. In general, alkaline earth metal carbonates are not soluble in water.
On the other hand, alkali metal carbonates (such as $K_{2}C{O}_3$), sulphates ($R{b}_{2}S{O}_4$) and iodates ($NaI{O}_3$) are soluble in water.