Which of the following substances produces hydrogen ions (H⁺) when dissolved in water?
Answer and explanation
Correct answer: Acid
The governing concept is the Arrhenius definition of an acid. When an acid dissolves in water, it increases the concentration of hydrogen ions, often represented as H⁺; for example, HCl separates into H⁺ and Cl⁻ in aqueous solution. A base generally produces OH⁻ ions, while a salt dissociates into its constituent ions and an indicator mainly changes colour. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
Acid
Why is this the correct answer?
The governing concept is the Arrhenius definition of an acid. When an acid dissolves in water, it increases the concentration of hydrogen ions, often represented as H⁺; for example, HCl separates into H⁺ and Cl⁻ in aqueous solution. A base generally produces OH⁻ ions, while a salt dissociates into its constituent ions and an indicator mainly changes colour. Therefore, option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
