Question

Which of the following ions forms a hydroxide that is highly soluble in water?

• A. $K^{+}$
• B. $Z{n}^{2+}$
• C. $N{i}^{2+}$
• D. $A{l}^{3+}$

Answer 1

Answer: (A)

$K^{+}$

1. $K^{+}$ ion will form most water soluble hydroxide because it is the most reactive of these metals and thus forms strong alkali $KOH$ which will undergo complete dissociation in water, thus making it highly soluble.