Concept:Kipp's apparatus is used to prepare small amounts of gases by reacting a solid with a liquid.Explanation:Kipp's apparatus is designed for gases that can be made from a solid and a liquid without heating.It is commonly used to produce hydrogen sulfide (H2S) by reacting iron(II) sulfide with dilute hydrochloric acid.The apparatus allows the reaction to stop automatically when the gas outlet is closed.Among the given options, hydrogen sulfide is the gas most typically prepared using Kipp's apparatus.Answer:D. H2S