Listenwhich change in the h+ ion concentration of an aqueous solution represents a decrease of one unit on the ph scale?

Explanation:

The pH scale is a logarithmic scale that runs from 1 to 14.

1 is the lower limit of the scale and 14 is the upper limit of the scale. On a pH scale, to represent a decrease of one unit, the concentration of the hydrogen ion or the hydroxyl ion must change.

A decrease in 1 unit or 1 pH represents a concentration of 10moldm⁻³.

                    Note: pH= -log₁₀[H⁺]

the answer is c i took the test

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.