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)

Answer : The correct option is, (4) .

Explanation :

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

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

Hence, the correct option is, (4) .

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

they are made of gases.

they have a spherical shape.

they make energy through fusion.