Answer: Option (2) is the correct answer.
Explanation:
It is known that when pH of a solution is less than 7 then the solution is acidic in nature and turns blue litmus into red. Whereas when pH of a solution is more than 7 then the solution is basic in nature and turns red litmus into blue.
Hydrogen ions can also be released in the form of hydronium ions ([tex]H_{3}O^{+}[/tex]).
And, when a solution has pH 9 then it means the solution is basic in nature.
That is, there will be more number of hydroxide or [tex]OH^{-}[/tex] ions as compared to hydrogen ions or [tex]H_{3}O^{+}[/tex] ions.
Thus, we can conclude that the statement it has a higher concentration of OH– than H3O+ and causes litmus to turn blue correctly describes a solution with a pH of 9.
