Which of the following ions forms a hydroxide that is highly soluble in water? (A) K^+ (B) Zn^2+ (C) Ni^2+ (D) Al^3+


K+ ion will form most water soluble hydroxide since it is the most reactive of these metals and therefore forms strong alkali KOH which will undergo complete dissociation in water, thus making it highly soluble

So, the correct option is (A)

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