Question

Which of the following is most soluble in water?

• A. $CsCl{O}_4$
• B. $NaCl{O}_4$
• C. $KCl{O}_4$
• D. $LiCl{O}_4$

Answer 1

Answer: (D)

Higher is the hydration energy, more will be the solubility in water. If the cations have different charge then the one with higher charge will have higher hydration energy. Among $CsCl{O}_4,NCl{O}_4$ and $LiCl{O}_4$ all of the cations have $+1$ charge, so for comparing hydration energy size factor will be considered Smaller is the size more will be the hydration energy. Thus, among all cations $L{i}^{+}$ is smallest in size. Hence , $LiCl{O}_4$ is most soluble in water