Which statement is true about strong acids?

Strong acids are characterized by their ability to fully dissociate in water, meaning that they break apart completely to release hydrogen ions (H⁺). This dissociation is a key feature that differentiates strong acids from weak acids, which only partially dissociate in solution.

When a strong acid, such as hydrochloric acid (HCl), is mixed with water, it separates into its constituent ions, producing a high concentration of H⁺ ions in the solution. This high concentration of hydrogen ions is why strong acids are known for their ability to lower the pH of a solution significantly and their strong reactivity with bases and other substances.

The other statements do not accurately describe strong acids. They are not only weakly reactive with bases, as they can engage in vigorous reactions. Strong acids also do not remain undissociated in a solution; rather, they dissociate completely. Lastly, strong acids will conduct electricity in solution due to the presence of free-moving ions, which is a crucial aspect of their behavior in an aqueous environment.