In which example is the solvent gaseous and the solute liquid?

Correct answer: Chloroform in nitrogen

In the example of chloroform in nitrogen, nitrogen is the gaseous continuous medium and chloroform is the liquid component dispersed or dissolved in it, so it represents a liquid-in-gas solution. Glucose in water is solid-in-liquid, hydrogen in palladium is gas-in-solid, and zinc in copper is solid-in-solid. Thus only option A fits both stated conditions.