This resource offers a Chemistry practice set on Hydrogen Chloride, designed to move students beyond rote learning and strengthen conceptual understanding. The questions explore laboratory preparation, drying and collection of HCl gas, the fountain experiment, acidic properties, characteristic reactions, gas tests, oxidation of chloride ions, absorption in water, constant-boiling mixtures, electrolytic behaviour, aqua regia, chloride testing, industrial applications, and gas-density comparisons. The resource uses real-life laboratory situations and application-based prompts, encouraging students to explain observations, predict outcomes, write equations, and connect chemical properties with practical applications. It is suitable for revision, classroom practice, homework, and assessment preparation.