27 what can be explained by the arrhenius theory? (1) the behavior of many acids and bases
(2) the effect of stress on a phase equilibrium
(3) the operation of an electrochemical cell
(4) the spontaneous decay of some nuclei

Answer : The correct option is, (1) the behavior of many acids and bases

Explanation :

The Arrhenius theory sates that an acid is a type of substance that ionizes in the water to give the hydronium ion or hydrogen ion and a bases is a type of substance that ionizes in the water to give hydroxide ion .

Or we can say that,

A substance that increases the hydroxide ion concentration of a solution is known as an Arrhenius base.

A substance that increases the hydrogen ion concentration of a solution is known as an Arrhenius acid.

Thus, the behavior of many acids and bases can be explained by the Arrhenius theory.

Hence, the correct option is, (1) the behavior of many acids and bases

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.