Answered

Based on the Arrhenius theory, when potassium

hydroxide dissolves in water, the only negative

ion in the aqueous solution is

(1) O2 (aq) (3) H (aq)

(2) OH2 (aq) (4) OH (aq)

Verified Answer :

olemakpadu

(4)  \(OH^{-}\) (aq)

That's the answer.

Answer : The correct option is, (4) \(OH^-(aq)\).

Explanation :

According to the Arrhenius theory, an acid is a substance that ionizes in water to gives \(H^+\) ions (hydronium ions or hydrogen ions) and a base is a substance which ionizes in water to gives \(OH^-\) ions (hydroxide ions).

As we know that when the potassium hydroxide (KOH) dissolves in water or ionizes in water to gives \(OH^-\) ions (hydroxide ions) and \(K^+\) ions (potassium ion). That means \(OH^-\) ion is a negative ion in aqueous solution and \(K^+\) ions is a positive ion in aqueous solution.

Hence, the correct option is, (4) \(OH^-(aq)\).

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