Question

A substance with which conc. hydrochloric acid reacts to liberate chlorine is ______.

विकल्प

• PbO

• PbCl₂

• PbO₂

• Pb₃O₄

Answer 1

A substance with which conc. hydrochloric acid reacts to liberate chlorine is PbO₂.

Explanation:

Lead dioxide (PbO₂) is a powerful oxidizing agent containing lead in its +4 oxidation state. It readily oxidizes the chloride ions of concentrated HCl to liberate greenish-yellow chlorine gas (Cl₂).