Question

Which of the following ions forms highly soluble hydroxide in water.

• A. $K^{+}$
• B. $Zn^{+ +}$
• C. $Al^{+ + +}$
• D. $Ca^{+ +}$

Answer 1

Answer: (A)

$K^{+}$

Answer 2

$K^{+}$ is highly soluble because of high hydration energy.